Head to Head
| England - Development League - U23 | 2021/09/27 12:00 | Cardiff U23 v Millwall U23 | L | 2-0 |
| England - Development League - U23 | 2021/02/16 13:00 | Cardiff U23 v Millwall U23 | L | 3-0 |
| England - Development League - U23 | 2020/11/25 11:00 | Millwall U23 v Cardiff U23 | W | 2-0 |
| England - Development League - U23 | 2020/02/03 14:00 | Millwall U23 v Cardiff U23 | W | 3-0 |
| England - Development League - U23 | 2019/10/07 12:00 | Cardiff U23 v Millwall U23 | L | 2-1 |
| England - Development League - U23 | 2019/02/18 13:31 | Millwall U23 v Cardiff U23 | L | 0-1 |
| England - Development League - U23 | 2018/09/24 11:57 | Cardiff U23 v Millwall U23 | D | 2-2 |
| England - Development League - U23 | 2018/01/08 11:58 | Cardiff U23 v Millwall U23 | D | 1-1 |
Home History
| England - Development League - U23 | 2021/11/30 13:30 | Millwall U23 v Bristol City U23 | D | 1-1 |
| England - Development League - U23 | 2021/11/22 13:00 | Ipswich U23 v Millwall U23 | D | 4-4 |
| England - Development League - U23 | 2021/11/08 19:00 | Colchester U23 v Millwall U23 | L | 2-0 |
| England - Development League - U23 | 2021/11/02 13:30 | Millwall U23 v Watford U23 | W | 2-1 |
| England - Development League - U23 | 2021/10/22 13:00 | Charlton U23 v Millwall U23 | L | 2-1 |
| England - Development League - U23 | 2021/10/19 12:30 | Millwall U23 v Swansea U23 | W | 3-1 |
| England - Development League - U23 | 2021/10/01 12:00 | Millwall U23 v QPR U23 | W | 3-1 |
| England - Development League - U23 | 2021/09/27 12:00 | Cardiff U23 v Millwall U23 | L | 2-0 |
Away History
| England - Development League - U23 | 2021/12/06 13:00 | Cardiff U23 v Watford U23 | W | 4-0 |
| England - Development League - U23 | 2021/11/30 13:00 | Cardiff U23 v Colchester U23 | W | 2-0 |
| England - Development League - U23 | 2021/11/23 13:30 | QPR U23 v Cardiff U23 | W | 1-3 |
| England - Development League - U23 | 2021/11/01 19:00 | Swansea U23 v Cardiff U23 | W | 1-3 |
| England - Development League - U23 | 2021/10/26 11:00 | Ipswich U23 v Cardiff U23 | W | 1-2 |
| England - Development League - U23 | 2021/10/19 12:00 | Cardiff U23 v Charlton U23 | W | 4-1 |
| England - Development League - U23 | 2021/09/27 12:00 | Cardiff U23 v Millwall U23 | W | 2-0 |
| England - Development League - U23 | 2021/09/21 12:00 | Cardiff U23 v Sheff Utd U23 | W | 2-0 |