Head to Head
| England U23 Development League | 2019/10/07 12:00 | Cardiff U23 v Millwall U23 | L | 2-1 |
| England U23 Development League | 2019/02/18 13:31 | Millwall U23 v Cardiff U23 | L | 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 | 2020/01/27 13:00 | QPR U23 v Millwall U23 | D | 1-1 |
| England U23 Development League | 2020/01/13 13:00 | Charlton U23 v Millwall U23 | W | 0-2 |
| England U23 Development League | 2020/01/07 13:30 | Millwall U23 v Colchester U23 | W | 1-0 |
| England U23 Development League | 2019/12/20 13:00 | Bolton U23 v Millwall U23 | W | 0-1 |
| England U23 Development League | 2019/12/13 13:00 | Watford U23 v Millwall U23 | D | 1-1 |
| England U23 Development League | 2019/12/09 13:00 | Millwall U23 v Ipswich U23 | W | 4-1 |
| England U23 Development League | 2019/11/25 13:00 | Crystal Palace U23 v Millwall U23 | L | 4-2 |
| England U23 Development League | 2019/11/11 13:00 | Crewe U23 v Millwall U23 | W | 0-2 |
Away History
| England U23 Development League | 2020/01/29 13:00 | Crystal Palace U23 v Cardiff U23 | W | 2-3 |
| England U23 Development League | 2020/01/20 13:00 | Coventry U23 v Cardiff U23 | D | 1-1 |
| England U23 Development League | 2020/01/13 13:00 | Cardiff U23 v Colchester U23 | W | 2-1 |
| England U23 Development League | 2020/01/06 13:00 | Cardiff U23 v Coventry U23 | L | 0-1 |
| England U23 Development League | 2019/12/16 13:00 | QPR U23 v Cardiff U23 | L | 4-1 |
| England U23 Development League | 2019/12/09 13:00 | Watford U23 v Cardiff U23 | D | 1-1 |
| England U23 Development League | 2019/11/25 13:00 | Cardiff U23 v Charlton U23 | D | 0-0 |
| England U23 Development League | 2019/11/11 13:00 | Bristol City U23 v Cardiff U23 | D | 2-2 |