Head to Head
| England U23 Development League | 2020/11/25 11:00 | Millwall U23 v Cardiff U23 | L | 2-0 |
| England U23 Development League | 2020/02/03 14:00 | Millwall U23 v Cardiff U23 | L | 3-0 |
| England U23 Development League | 2019/10/07 12:00 | Cardiff U23 v Millwall U23 | W | 2-1 |
| England U23 Development League | 2019/02/18 13:31 | Millwall U23 v Cardiff U23 | W | 0-1 |
| England U23 Development League | 2018/09/24 11:57 | Cardiff U23 v Millwall U23 | D | 2-2 |
| England U23 Development League | 2018/01/08 11:58 | Cardiff U23 v Millwall U23 | D | 1-1 |
| England U23 Development League | 2017/10/16 13:25 | Millwall U23 v Cardiff U23 | D | 1-1 |
| England U23 Development League | 2017/01/30 14:00 | Cardiff U23 v Millwall U23 | D | 1-1 |
Home History
| England U23 Development League | 2021/02/09 13:00 | Cardiff U23 v Colchester U23 | W | 4-1 |
| England U23 Development League | 2021/02/02 13:00 | Cardiff U23 v Ipswich U23 | W | 4-0 |
| England U23 Development League | 2021/01/19 13:00 | Cardiff U23 v Swansea U23 | W | 2-1 |
| England U23 Development League | 2021/01/11 13:00 | Charlton U23 v Cardiff U23 | L | 4-0 |
| England U23 Development League | 2020/12/22 13:00 | Cardiff U23 v QPR U23 | W | 1-0 |
| England U23 Development League | 2020/12/15 13:00 | Watford U23 v Cardiff U23 | D | 2-2 |
| England U23 Development League | 2020/11/28 11:00 | Colchester U23 v Cardiff U23 | L | 2-0 |
| England U23 Development League | 2020/11/25 11:00 | Millwall U23 v Cardiff U23 | L | 2-0 |
Away History
| England U23 Development League | 2021/02/05 13:00 | Millwall U23 v QPR U23 | L | 0-1 |
| England U23 Development League | 2021/02/01 13:00 | Charlton U23 v Millwall U23 | D | 1-1 |
| England U23 Development League | 2021/01/18 13:00 | Millwall U23 v Ipswich U23 | L | 0-1 |
| England U23 Development League | 2021/01/12 13:00 | Swansea U23 v Millwall U23 | D | 0-0 |
| England U23 Development League | 2020/12/15 12:00 | Millwall U23 v Colchester U23 | W | 6-1 |
| England U23 Development League | 2020/11/25 11:00 | Millwall U23 v Cardiff U23 | W | 2-0 |
| England U23 Development League | 2020/11/17 13:00 | Millwall U23 v Wigan U23 | L | 0-2 |
| England U23 Development League | 2020/11/10 13:00 | Millwall U23 v Crewe U23 | W | 1-0 |