AEK Athens

The large Greek population of Constantinople, not unlike that of the other Ottoman urban centres, continued its athletic traditions in the form of numerous athletic clubs. Clubs such as Énosis Tatávlon (Ένωσις Ταταύλων) and Iraklís (Ηρακλής) from the Tatavla district, Mégas Aléxandros (Μέγας Αλέξανδρος) and Ermís (Ερμής) of Galata, and Olympiás (Ολυμπιάς) of Therapia existed to promote Hellenic athletic and cultural ideals. These were amongst a dozen Greek-backed clubs that dominated the sporting landscape of the city in the years preceding World War I. After the war, with the influx of mainly French and British soldiers to Constantinople, many of the city's clubs participated in regular competitions with teams formed by foreign troops. Taxim, Pera, and Tatavla became the scene of weekly competitions in not only football, but also athletics, cycling, boxing, and tennis.

Football in the city was dominated by Énosis Tatávlon and Ermís. Ermís, one of the most popular sports clubs, was formed in 1875 by the Greek community of Pera (Galata). Known as "Pera" since the mid-1880s, and "The Greek Football Team" when its football department was formed in 1914, it was forced to change its name to "Pera Sports Club", and then "Beyoğluspor Kulübü" in 1923. Many of its athletes, and those of most other sporting clubs, fled during the population exchanges at the end of the Greco-Turkish War, settling in Athens and Thessaloniki.

The founders of AEK – a group of Constantinopolitan refugees (among them former athletes from the Pera Sports Club and the other Constantinopolitan clubs) – met at the athletic shop "Lux" owned by Emilios Ionas and Konstantinos Dimopoulos on Veranzerou Street, in the centre of Athens, and created AEK. Their intention was to create a club that provided athletic and cultural diversions for the thousands of predominantly Constantinopolitan and Anatolian refugees who had settled in the new suburbs of Athens (including Nea Filadelfeia, Nea Ionia, Nea Chalkidona, Nea Smyrni).

The first AEK team was: GK: Kitsos, DF: Ieremiadis, DF: Asderis, MF: Kechagias, MF: Paraskevas, MF: Dimopoulos, MF: Karagiannides, FW: Baltas, FW: Milas, FW: Iliades, and FW: Georgiades. AEK played their first match against Aias Athinon in November 1924, winning by 2–0.

AEK's football team grew rapidly in popularity during the 1920s, eclipsing the already-established Athens-based refugee clubs (Panionios, Apollon Smyrnis, etc.), thanks mainly to the large pool of immigrants that were drawn to the club, the significance of the name "Constantinople" for many refugees and Greeks, plus, in no small part, to the political connections and wealth of several of the club's board members. Not possessing a football ground, AEK played most of its early matches at various locations around Athens, including the grounds of the Temple of Olympian Zeus and the Leoforos Alexandras Stadium.

AEK's first president, Konstantinos Spanoudis (1871–1941), a journalist and associate of the Prime Minister Eleftherios Venizelos, petitioned the government to set aside land for the establishment of a sports ground. In 1926, land in Nea Filadelfeia, which was originally set aside for refugee housing, was donated as a training ground for the refugees' sports activities. AEK began using the ground for training, albeit unofficially.

In 1928, Panathinaikos, Olympiacos, and AEK began a dispute with the fledgling Hellenic Football Federation (EPO), decided to break away from the Athens regional league, and formed an alliance called POK. During the dispute, POK organised friendly matches against each other and several continental European clubs. In 1929, though, the dispute ended and AEK, along with the other POK clubs, entered the EPO fold once again.

In 1930, the property where AEK trained was officially signed over to the club. Venizelos soon approved the plans to build what was to become AEK's home ground for the next 70 years, the AEK Stadium. The first home game, in November 1930, was an exhibition match against Olympiacos that ended in a 2–2 draw.

In 1932, AEK won their first Greek Cup title, beating Aris 5–3 in the final. The team boasted a number of star football players like Kostas Negrepontis (a veteran of the original Pera Club of Constantinople), Kleanthis Maropoulos, Tryfon Tzanetis, Michalis Delavinias, Giorgos Mageiras and Spyros Sklavounos.

The club's mixed success during the 1930s was highlighted by the first Greek Championship and Greek Cup (winning the double) in 1939. Under former player Kostas Negrepontis as head coach, AEK also won the Greek Championship of 1940.

With Kostas Nestoridis scoring goals in the early 1960s (top goalscorer for 5 seasons in row, from 1958 to 1963), and the timely signing of attacker Mimis Papaioannou (the club's all-time top goalscorer and record appearance maker) in 1962, AEK went on to win the 1962–63 championship. Known affectionately as "Mimis" by the AEK supporters, Papaioannou scored twice in the 1963 playoff against Panathinaikos, leveling the score at 3–3 and giving AEK its first post-war championship on goal aggregate. Coached by Hungarian-German Jenő Csaknády, the championship team also consisted of Stelios Serafidis, Miltos Papapostolou, and Andreas Stamatiadis. Youngsters like Alekos Sofianidis, Stelios Skevofilakas, Giorgos Petridis, and Manolis Kanellopoulos played a significant role in the victorious 1963 campaign.

The club followed up with Cup victories in 1964 and 1966. With the return of Csaknády to the coach's position in 1968 and the addition of some great players like Kostas Nikolaidis, Giorgos Karafeskos, Panagiotis Ventouris, Fotis Balopoulos, Spyros Pomonis, Alekos Iordanou, Nikos Stathopoulos and Andreas Papaemmanouil, AEK easily won the 1967–68 championship.

In the 1968–69 season AEK, under Yugoslav coach Branko Stanković, became the first Greek football club to reach the quarter-finals of the European Champions Cup, but were eliminated by the Czechoslovakian Spartak Trnava.

The addition of goalkeeper Stelios Konstantinidis and Apostolos Toskas reinforced the team, and allowed AEK to take their fifth championship title in 1971.

Loukas Barlos, a successful industrialist, took over the presidency and financing of AEK in 1974, and with the help of coach František Fadrhonc built one of the finest teams in the club's history. The Barlos "Golden Era" saw some of the greatest players ever to have played for AEK: Christos Ardizoglou, Giorgos Dedes, Giorgos Skrekis, the Germans Walter Wagner and Timo Zahnleiter, Dionysis Tsamis, Lakis Nikolaou, Petros Ravousis, Dušan Bajević, Takis Nikoloudis, Stefanos Theodoridis, Babis Intzoglou and Nikos Christidis.

Captained by Papaioannou in the 1976–1977 season, AEK reached the semi-finals of the UEFA Cup competition, the first Greek football club to do so. Beating Dynamo Moscow (Russia) 2–0, Derby County (England) 2–0 and 3–2, Red Star Belgrade (Yugoslavia) 2–0, and QPR (England) 3–0 and 7–6 on penalties, AEK were eventually eliminated by Gianni Agnelli's Juventus. Juventus went on to win their first European title.

It was during this period that AEK signed one of Greece's finest strikers, Thomas Mavros, the all-time top goalscorer in the Greek Championship. In the following years, he and Dušan Bajević formed a formidable attacking duo for AEK. Mavros was an integral part of the team that reached the UEFA Cup semi-final in 1976, but it was his devastating form (top goalscorer in 1978 and 1979 – 22 and 31 goals, respectively) that helped AEK to win the 1977–78 Championship-Cup double. The addition of former Panathinaikos stars Domazos and Eleftherakis to the AEK squad the following year saw the club cap off their most successful decade to date by winning the 1979 Championship.

Under the leadership of Loukas Barlos, the Nikos Goumas Stadium was finally completed with the addition of the iconic covered stand, or Skepasti (Σκεπαστή), which eventually became home to the most fanatic of AEK supporter groups, "Original 21". The next generation of star players, fresh out of AEK's Academy, made their debut during this period: Stelios Manolas, Spyros Ikonomopoulos, Vangelis Vlachos, and Lysandros Georgamlis.

With new president Michalis Arkadis and Austrian head coach Helmut Senekowitsch, AEK won the 1983 Greek Cup, beating PAOK 2–0 in the newly built Athens Olympic Stadium. Thomas Mavros and Vangelis Vlachos were the goalscorers.

AEK also chased the elusive Championship title and it finally came in 1989. Coached by former player Dušan Bajević, AEK clinched the title after winning a crucial match 1–0 against Olympiacos at the Athens Olympic Stadium. Takis Karagiozopoulos scored the goal that gave AEK its first Championship after ten years. AEK won also the Greek Super Cup of 1989, beating Panathinaikos on penalties after the match ended in a 1–1 draw.

After the 1989 triumphs, under Bajević, AEK built what was to become one of the most successful teams in its history. Captained by Stelios Manolas, the team, which included Toni Savevski, Daniel Batista, Vaios Karagiannis, Vasilis Dimitriadis, Giorgos Savvidis, Alexis Alexandris, Vasilios Tsiartas, Michalis Kasapis, Refik Šabanadžović and Vasilios Borbokis dominated the Greek league through the 1990s with three successive Championship titles (1992, 1993, and 1994). AEK won the only Greek League Cup ever organised in 1990 (beating Olympiacos 3–2).

In 1994–95, AEK became the first Greek football club to participate in the group stage of the UEFA Champions League after defeating Scottish champions Rangers; AEK were eliminated by Ajax and AC Milan, who made it to the final. With Michalis Trochanas as president and Dušan Bajević as coach, the club won the Greek Cup in 1996.

Former player Petros Ravousis took over the coaching position when Dušan Bajević left for Olympiacos at the end of 1996. Ravousis led the team to its second Super Cup in 1996, and its eleventh Cup title in 1997, beating Panathinaikos in both finals.

By far AEK's most successful run with titles, the period also saw the club sign Temur Ketsbaia and several young, talented players like Demis Nikolaidis, Christos Kostis, Christos Maladenis and Akis Zikos. Nikolaidis, in particular, an AEK fan since childhood, declined more lucrative offers from Olympiacos and Panathinaikos to sign for his beloved club. During the 1996–97 and 1997–98 seasons, AEK progressed to the quarter-finals of the UEFA Cup Winners' Cup, where they were eliminated by Paris Saint-Germain and Lokomotiv Moscow.

In 1999, ex-president Dimitris Melissanidis organised a friendly match against Partizan in Belgrade, during the height of the NATO bombing of Serbia. As a gesture of compassion and solidarity towards the embattled Serbs, the AEK players and management staff defied the international embargo and traveled to Belgrade for the match. The game ended 1–1, when after 60 minutes thousands of Serbian football fans invaded the pitch to embrace the footballers.

AEK won its twelfth Cup title in 2000 under coach Giannis Pathiakakis, defeating Ionikos 3–0 in the final. The club continued its consistency in the Championship of 2001–02, finishing second on goal difference behind Olympiacos, and beating Olympiacos in the Greek Cup final.

Dušan Bajević returned as coach in the summer of 2002, a move that sparked open hostility towards Bajević from a section of AEK supporters. A strong team, called Dream Team by the fans, was created with players like Kostas Katsouranis, Ilija Ivić, Dionysis Chiotis, Vasilios Borbokis, Grigoris Georgatos, Theodoros Zagorakis, Walter Centeno, Michalis Kapsis, Michel Kreek, Vasilios Lakis, Vasilios Tsiartas (who returned from Sevilla), Ioannis Okkas, Nikos Liberopoulos and Demis Nikolaidis.

Under Bajević, AEK progressed through the qualifying rounds in the 2002 UEFA Champions League by eliminating APOEL. Drawn in Group A with AS Roma, Real Madrid, and Racing Genk, AEK with good performances drew all their games and were knocked out of the competition. They continued to UEFA Cup, eliminating Maccabi Haifa (4–0, 4–1) before being knocked out by Málaga CF.

Off the field, the presidency of Makis Psomiadis caused many problems for AEK, whose mismanagement put the club into debt. He was also accused of assaulting club captain Demis Nikolaidis and other players with the assistance of his bodyguards.

After the altercation, and partly due to the club's growing financial problems, Nikolaidis left on a free transfer by mutual consent to Atlético Madrid. Unable to cope with the negativity from a large section of AEK fans, Bajević resigned in 2004 after a match against Iraklis.

In 2004, Demis Nikolaidis and other significant AEK followers formed a supporters' club Enosis 1924 (Union 1924) to motivate all AEK supporters into taking up the club's shares and governance. The project was not fully realised because, in the meantime, various businessmen decided to buy shares and invest money in the club. However, to this date, Enosis 1924's chairman is a member of the AEK FC board. The same year, Nikos Goumas Stadium, AEK's home stadium for over 70 years, was demolished, large parts of it having been damaged by the 1999 Athens earthquake.

In 2004, on the back of strong AEK fan support, Nikolaidis, at the head of a consortium of businessmen, bought out the beleaguered club and became the new president. His primary task was to lead AEK out of its precarious financial position. The first success was an arrangement through the Greek judicial system to write off most of the massive debt that previous club administrators had amassed and to repay any remaining public debts in manageable installments.

Securing the club's existence in the Alpha Ethniki, Nikolaidis then began a program to rebuild AEK to its former glory. He appointed experienced former player Ilija Ivić as technical director and brought back Fernando Santos as a coach. The AEK fans, emboldened by Nikolaidis' efforts, followed suit by buying season ticket packages in record numbers (over 17,000).

AEK recruited promising young players to strengthen a depleted team. Led by the experienced Katsouranis and Liberopoulos, and featuring Brazilian Júlio César, the club made it to the Greek Cup final for the seventh time in 13 years but finished second in the Championship, and in the process, secured a place in the third qualifying round of the UEFA Champions League. For the 2006–07 season, former Real Betis coach Lorenzo Serra Ferrer was appointed to the coaching position after Fernando Santos' contract was not renewed.

By beating Hearts over both legs (2–1 in Scotland and 3–0 in Greece), AEK progressed to the group stage of the Champions League. The club obtained a total of 8 points, having beaten AC Milan 1–0, Lille 1–0, and managing two draws with Anderlecht (1–1 in Greece and 2–2 in Belgium). AEK finished second in the Greek Super League, qualifying again for the third round in the UEFA Champions League.

For the 2007–08 season AEK changed kit sponsors from Adidas to Puma. They played with Sevilla FC in the UEFA Champions League third qualifying round. The first leg was played on 15 August, away at the Ramón Sánchez Pizjuán, where AEK were defeated by 2 goals, and the second leg played on 3 September, at the Athens Olympic Stadium where AEK lost again by 1–4.

AEK completed the signings of Brazilian legend Rivaldo, after he was let free from Olympiacos, Rodolfo Arruabarrena, Charis Pappas, and Argentine striker Ismael Blanco. Traianos Dellas was rewarded with a new contract, keeping him at the club until the summer of 2009. On 25 August, the Super League and EPO decided to postpone the opening season's games due to the fire disaster in the Peloponnese.

After being eliminated from the UEFA Champions League, AEK were drawn to play against FC Salzburg in the UEFA Cup. On 20 September, AEK claimed a home win over Salzburg by the scoreline of 3–0. In the second leg, played in Salzburg on 4 October, AEK lost the match but still went through 3–1 on aggregate. On 9 October, AEK were drawn in Group C in the UEFA Cup group stage along with Villarreal, Fiorentina, Mladá Boleslav, and Elfsborg. On 25 October, AEK kicked off the group stage with a 1–1 draw away to Elfsborg. On 29 November, AEK again drew 1–1, this time at home to Fiorentina. On 5 December, AEK won Mladá Boleslav 1–0 away and on 20 December, AEK were defeated at home with 1–2 by Villarreal, but finally booked a place in the knockout stage of the UEFA Cup by finishing third in the group. They were then drawn against Getafe in the third round (phase of 32). AEK advanced to the third round of the UEFA Cup for the second consecutive season.

On 12 February, AEK parted company with Lorenzo Serra Ferrer after a poor run of form and unsuccessful signings and replaced him with former player Nikos Kostenoglou, on a caretaker basis. The team initially finished in first place in the league, but after the court case between Apollon Kalamarias and Olympiacos for the illegal usage of a player in the 1–0 Apollon Kalamarias win earlier in the season, Olympiacos was awarded 3 points, thus finishing 2 points ahead of AEK.

President Demis Nikolaidis and several other managers and chairmen were angered with the court's decision, stating that the Hellenic Football Federation knew about the usage of the illegal player prior to the game and had indeed issued a registration (blue card), but didn't do anything about it. Panathinaikos also challenged the result at the Court of Arbitration in Sport (CAS) with no success, as the Hellenic Federation did not support the claim. Rivaldo had stated his intention to leave Greece if the ruling went in favour of Olympiacos and AEK were not declared champions. He stated, "A team that was not good enough to win the title on the pitch does not deserve the trophy".

Giorgos Donis was appointed head coach of AEK on 14 May. His reign at the club did not go well. It began when AEK failed to defeat AC Omonia in the UEFA Cup second qualifying round, which meant their elimination from European competitions for the season. Rivaldo asked to leave the club to sign for Bunyodkor on 27 August.

The league campaign started very well after a win over rivals Panathinaikos in the opening game of the season, but poor performances and results from then on left AEK in a difficult situation. Head coach Donis was eager to leave the club, but president Nikolaidis did not allow him to leave. Nevertheless, Nikolaidis left due to disappointing results and after a controversy with the club's supporters, Original 21, leaving the presidency temporarily to the members of the board of directors, Nikos Koulis, and Takis Kanellopoulos.

However, the series of disappointing results continued, bringing anger and insecure situations for everyone on the team. The first to be hit by this wave of disappointment and upset with the team council was coach Donis, who was asked to leave the team. On 21 November 2008, AEK hired Dušan Bajević as head coach for third time. However, after a while, Takis Kanellopoulos left the club, as he sparked a rivalry with Bajević.

On 4 February 2009, Nikos Thanopoulos was elected as the 41st president of AEK FC. Bajević brought some much-needed stability to the club, and performances on the pitch improved vastly towards the end of the season, culminating in AEK's progression to the Greek Cup final against Olympiacos which was played on 2 May 2009, at Athens Olympic Stadium. AEK lost in the final 14–15 on penalties. AEK finished the regular season in fourth position, thus qualifying for the season's playoffs, in which they eventually finished second, just missing out on UEFA Champions League qualification.

In the summer transfer period of 2010, AEK, despite being low on budget, managed to reinforce its ranks with many notable players. Club idols Nikos Liberopoulos and Traianos Dellas signed the last one-year contracts of their careers, and many new and experienced players signed to AEK, the most notable of whom were Papa Bouba Diop, Cristian Nasuti, and Christos Patsatzoglou. AEK qualified for the 2010–11 Europa League group stage after defeating Dundee United 2–1 on aggregate.

On 7 October 2010, Manolo Jiménez agreed to a two-year deal and took over for Bajević.

On 30 April 2011, AEK won the Greek Cup for the 14th time, defeating 3–0 Atromitos at the final.

To compensate for the departures of Nacho Scocco, Papa Bouba Diop, Sebastián Saja, and Ismael Blanco in the summer of 2011, AEK signed the captain of Iceland Eiður Guðjohnsen, and Colombian international Fabián Vargas. Due to financial problems, on 25 June 2012, AEK legend Thomas Mavros took over the club's management and on 1 August 2012, became president in an effort to save the club from financial disaster. Many other former AEK players like Vasilis Tsiartas, Mimis Papaioannou, Kostas Nestoridis, Christos Kostis, Vangelis Vlachos, Christos Arvanitis, and Giorgos Karafeskos were hired to help the club return to its previous glory days. Due to bad results, on 30 September 2012, Vangelis Vlachos was fired and Ewald Lienen hired as AEK's head coach. On 9 April 2013, Lienen was fired after disappointing results and AEK hired Traianos Dellas as head coach with Vasilis Borbokis and Akis Zikos as assistants.

On 19 April 2013, a Super League disciplinary committee voted to remove 3 points from AEK and award Panthrakikos a 3–0 win, after fans stormed the pitch and chased players from the field during the AEK–Panthrakikos match on 14 April 2013. As a result, AEK were relegated from the Super League to the second-tier Football League for the first time in their history. In addition, AEK were to start their Football League campaign with minus 2 points.

On 7 June 2013, during an AEK council, it was decided that AEK FC would become an amateur football club and would not participate in the Football League division for the 2013–14 season, preferring instead, to self-relegate and participate in the Football League 2 division and start from scratch. On the same day Dimitris Melissanidis, the former president of the club, became administrative leader of the club, under the supervision of Amateur AEK, with the aim of saving the club. Along with other notable AEK fans and old players, they went on to create the non-profit association Independent Union of Friends of AEK (Greek: Ανεξάρτητη Ένωση Φίλων ΑΕΚ; Anexártiti Énosi Fίlon AEK) which took the majority stake of the football club.

AEK began its revival by signing Traianos Dellas as their new head coach. Dellas led AEK to first place in the third national division with a record of 23 wins, 3 draws, and only one defeat. The following year AEK participated in the 2014–15 Football League, finishing first and undefeated in the regular season standings. AEK successfully finished first in the playoffs and gained promotion back to the top tier, the Greek Super League. The club's biggest signing after returning to the Greek Super League was that of Argentinian star Diego Buonanotte, who only stayed at the club for a year.

On 20 October 2015, Traianos Dellas was forced to resign as a result of a dispute with the board, and a heavy 4–0 away loss to Olympiacos. Stelios Manolas was named interim coach and later Gus Poyet was appointed as new head coach. On 19 April, Poyet was fired by AEK Athens after being accused by the board of revealing private club conversations. Stelios Manolas took charge as interim coach once again. Manolas managed to guide AEK to a 3rd-place finish in the league qualifying for the playoff round and also to their first piece of silverware since the 2010–11 season by lifting the Greek Cup, defeating Olympiacos in the final 2–1. With the postponement of the final on two separate occasions and the congested fixture list of the playoff round, AEK had to play a fixture every three days, which evidently took its toll on the players, but they finished third in the playoffs and qualified for the 2016–17 UEFA Europa League Third Qualifying Round. The first season back in the top flight was considered a success with a trophy and qualification for European football the following season, a return after a five-year hiatus.

The new season started with high expectations by AEK Athens fans as the club signed Dmytro Chyhrynskyi, Hugo Almeida and Joleon Lescott, announcing three of the biggest transfers in their history. Unfortunately, the 34-year-old English defender suffered a knee detached cartilage while cycling in his apartment. The injury ruled Lescott out for the remainder of the season. The player refused to get help from the team's doctors and insisted on completing his rehabilitation in the United Kingdom. The board did not agree to the player's wishes and additional demands, which resulted in his contract being terminated. This outcome led what it until then seemed to be a powerful defending duo to a midsummer night's nightmare. In addition, a 0–1 aggregate loss to AS Saint-Étienne in the Europa League qualifiers brought disappointment to fans' dreams of European participation. Nevertheless, AEK defeated Xanthi 4–1 in the first match of the season, raising hopes for domestic success. However, the decision was made to replace Temur Ketsbaia with José Morais; the decision was based on the team's stuttering start to the season, 3 wins, 2 draws and 2 losses, and poor displays. José's arrival, however, did not improve the team's results or performances, winning only three of his fourteen matches as manager. On 19 January 2017, former manager Manolo Jiménez was appointed as manager for the second time following José's resignation. Upon his appointment he got the team from 7th place up to a 4th-place finish, and first place in the European Playoffs, claiming second place in the league overall and qualifying for the UEFA Champions League Third qualifying round. Jiménez also guided the team to a second consecutive Greek Cup final where they faced PAOK in a controversial game marred by pre-match violence between the two sets of fans and a winning goal from an offside position.

The third season back in the top flight began with a tough draw in the Champions League Third qualifying round versus CSKA Moscow, ending in a 3–0 aggregate loss. The defeat meant AEK were demoted to the Europa League play-off round where they were pitted against Belgians Club Brugge. A 0–0 draw in Brugge in the first leg and a 3–0 win in the return in Athens meant that AEK qualified for the group stages of a major European competition for the first time in 6 years. They were seeded in pot 4 and drawn along with AC Milan, HNK Rijeka and Austria Wien. AEK would go on to qualify for the round of 32 undefeated, a statement that solidified their return as one of Europe's elite teams, with a record of 1 win and 5 draws, the most notable being the two back-to-back 0–0 draws versus AC Milan. In the Round of 32 AEK were drawn against Ukrainian giants Dynamo Kyiv. AEK were better than their opponents, but also were unlucky and lost after two draws and on away goal rule. The first match took place in Athens, with a 1–1 draw and the second game in Kyiv, finished 0–0. In April, AEK won their 12th Greek championship, by recording a 2–0 home win against Levadiakos in front of 60,000 fans. This was their first championship after 24 years. AEK were crowned champions in front of 14,500 of their fans in the last matchday against Apollon Smyrnis at Georgios Kamaras Stadium.

The 2018–19 season was the season that AEK returned to the groups of the UEFA Champions League, for the 5th time in the club's history after eliminating Celtic (3–2 on aggregate) and MOL Vidi (3–2 on aggregate) in the qualifying stages.

Led by former Panathinaikos' manager, Marinos Ouzounidis, AEK were drawn in Group E against Bayern Munich, Benfica and Ajax but failed to make an impact after losing all six matches.

Key players Jakob Johansson, Lazaros Christodoulopoulos, Sergio Araujo and Ognjen Vranješ, as well as manager Manolo Jiménez, who were essential to the triumphant 2017–18 season, left the club, and most transfers failed to improve the team. Greek international Marios Oikonomou and Argentine striker Ezequiel Ponce were the only newcomers who managed to make an impact on an overall disappointing season (3rd place, 23 points behind 1st PAOK and 18 points behind 2nd Olympiacos – third consecutive cup final loss from PAOK, 1–0).

2017–18 champions, Ognjen Vranješ and Sergio Araujo returned to Athens, and some other notable additions included Portuguese international Nélson Oliveira and Serbian midfielder Nenad Krstičić. The 2019–20 season started catastrophically, with an early Europa League elimination by the Turkish side Trabzonspor (1–3 in Athens, 0–2 in Trabzon, 3–3 on aggregate) and disappointing domestic results. New manager Miguel Cardoso was sacked quickly and replaced with the club's veteran player and manager, Nikos Kostenoglou who was also later replaced by Italian manager Massimo Carrera.

Under Carrera, AEK regained the confidence lost from the previous season and a half of bad results. Before the lockdown caused by the COVID-19 pandemic, AEK was 3rd in the regular season and in the semi-finals of the Greek Cup (2–1 home victory against Aris in the first leg). Later they would reach the final for the fifth time in a row. However, they lost 1–0 to Olympiacos.

After the draw for the Europa League third qualifying round, AEK Athens got VfL Wolfsburg at the Play-off round and won 2–1 at the Athens Olympic Stadium, securing qualification to the Group stage. However, AEK's campaign results in the Europa League as well as the first half of the domestic Superleague were lackluster, the European campaign being one of their worst ever, only recording 1 win in the group stages. In December, Massimo Carrera was relieved of his duties and replaced by Manolo Jiménez, previous Super League and Greek Cup winner with AEK – his fourth term at the club.

Hoping to rebuild, AEK acquired the services of Vladan Milojević. However, his tenure ended early, with AEK Athens being disqualified on penalties by Bosnia and Herzegovina club, Velež Mostar in 2021–22 Europa Conference League second qualifying round. Barely making it to Christmas, Milojevic's head was turned by an offer from the Middle East, and AEK sacked him. They hired the Greek coach Argiris Giannikis, who managed PAS Giannina successfully prior to his appointment. However, his time at AEK was short and once again, he was sacked, with AEK B coach Sokratis Ofrydopoulos managing AEK through the turbulent play-off period and an exclusion from Europe. It was at this time that AEK searched for a new coach, and found one in the form of Matías Almeyda.

Ahead of the 2022–23 season and AEK's entry into Agia Sophia Stadium, AEK underwent another rebuild under the leadership of Matias Almeyda. Signed as coach towards the end of the 2021–22 season but only taking over in the 2022–23 pre-season, Almeyda played a huge part in AEK's 2022–23 success. Instilling a high-pressing, tireless, and attractive style of attacking football, he established AEK quickly as the best team in Greece along with Panathinaikos, themselves under the leadership of Ivan Jovanovic. Despite initial losses, Almeyda gave AEK great derby victories and team cohesion. Overcoming Panathinaikos' fantastic early-season unbeaten run, being 8 points behind the league leaders, AEK were level on points with Panathinaikos in the playoff round. Notably, AEK defeated PAOK 2–0 at home, 1–0 away, Panathinaikos 1–0, Olympiacos 3–0 in the Greek Cup (reaching the final with PAOK), and 3–1 away. They also underwent a 14-game win-streak at their new stadium, the Agia Sofia or OPAP Arena stadium.

The newly built stadium is located in the place where the old Nikos Goumas Stadium was situated, at Nea Filadelfeia. The Agia Sophia Stadium, also known as OPAP Arena for sponsoring reasons, is a category 4 UEFA stadium and can host 32,500 spectators. The net construction cost is estimated around € 81,700,000. The administrative region of Attica funded the stadium with the amount of € 20,000,000. The stadium's opening ceremony took place on 30 September 2022. AEK Athens beat Ionikos 4–1 in the inaugural match on 3 October 2022, which was the sixth fixture of the 2022–23 Greek Super League.

In the summer transfer window of the 2022–23 season, AEK Athens announced the signing of two famous football players who played as opponents in the 2018 FIFA World Cup final in Russia. The first player was the Croatian center-back Domagoj Vida who previously played for Süper Lig side Beşiktaş, and the second player was the French right-back Djibril Sidibé, most recently of Ligue 1 club Monaco. The latter is the most valuable player to have ever arrived at the club with a market value of € 8,000,000, surpassing the previous record holder Juanfran by € 2,000,000. Sidibé is also the fifth World Cup winner to play in the Greek Super League, after Frenchman Christian Karembeu and Brazilian stars Rivaldo, Gilberto Silva and Denilson.

AEK Athens were crowned champions on 14 May 2023, after beating Volos 4–0 to seal the title, 5 points ahead of second place Panathinaikos. AEK Athens thus won their 13th championship and the first in Nea Filadelfeia since 1994. On 25 May 2023, AEK Athens defeated PAOK 2–0 in the 2022–23 Greek Cup final to win the title and seal the double for the first time since 1978. The following season, AEK Athens went head-to-head throughout the whole season against PAOK, and ended up losing a potential second consecutive title, on the final game of the season, staying two points behind the first place. They lost in the Round of 16 of the Greek Cup against Aris on penalties, and got eliminated in the group stage of the UEFA Europa League, in a group of death against AFC Ajax, Brighton & Hove Albion F.C. and Olympique de Marseille.

Following an ultimately disappointing season for AEK and a missed chance to win a second consecutive league title, major shareholder and owner Dimitris Melissanidis announced his departure from the club's ownership on June 10th, 2024, selling his shares to Seajets owner, Marios Iliopoulos for a seeming €90 million. At his final interview, Melissanidis stated that he "had completed his part and brought AEK back to the top, with a new stadium, a competitive team in Greek and European football, and zero debt".

At Iliopoulos presentation, AEK fans got a taste of what his vision was for the club, as he stated he wants a competitive team that will dominate Greek football and become a significant European power, while also focusing on the one thing AEK was lacking in, their academies. On a question regarding an increase on the transfer budget and a change on the current transfer policy, he urged AEK fans to "put on their seatbelts slowly and enjoy it". Not long after, Iliopoulos backed his words up with actions, selling Ezequiel Ponce for a club record €9,000,000, while signing renowned players like Roberto Pereyra, Erik Lamela and Thomas Strakosha with club record contract fees.

The season, however, started with an early elimination of AEK from the Conference Cup by FC Noah.

On 19 September 2024, the club announced ex Manchester United player, Anthony Martial, on a three-year deal. This is the club's highest valued player arrival, with an estimate of €10m. In October 2024 they announced the signing of Javier Ribalta as their new Executive Director.