Head to Head
| England Development League 2 | 2025/02/07 13:30 | Millwall U21 v Cardiff U21 | L | 2-0 |
| England Development League 2 | 2023/12/18 13:30 | Millwall U21 v Cardiff U21 | L | 5-1 |
| England Development League 2 | 2023/09/26 13:00 | Cardiff U21 v Millwall U21 | L | 0-1 |
| England Development League 2 | 2023/02/21 12:00 | Cardiff U21 v Millwall U21 | W | 4-2 |
| England Development League 2 | 2022/10/31 14:00 | Millwall U21 v Cardiff U21 | L | 5-0 |