Head to Head
| England U23 Development League | 2020/02/03 14:00 | Millwall U23 v Cardiff U23 | W | 3-0 |
| 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 | 2020/11/17 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 |
| England U23 Development League | 2020/11/03 13:00 | Sheff Wed U23 v Millwall U23 | W | 0-1 |
| England U23 Development League | 2020/10/16 12:00 | Coventry U23 v Millwall U23 | W | 0-1 |
| England U23 Development League | 2020/10/06 11:00 | Millwall U23 v Charlton U23 | L | 0-1 |
| England U23 Development League | 2020/09/29 12:00 | QPR U23 v Millwall U23 | W | 1-2 |
| England U23 Development League | 2020/09/21 12:00 | Millwall U23 v Watford U23 | D | 2-2 |
| England U23 Development League | 2020/09/15 12:00 | Ipswich U23 v Millwall U23 | D | 1-1 |
Away History
| England U23 Development League | 2020/11/01 13:30 | Crewe U23 v Cardiff U23 | L | 1-0 |
| England U23 Development League | 2020/10/27 13:00 | Cardiff U23 v Hull U23 | W | 2-0 |
| England U23 Development League | 2020/10/20 13:00 | Sheff Wed U23 v Cardiff U23 | L | 1-0 |
| England U23 Development League | 2020/10/06 12:00 | Ipswich U23 v Cardiff U23 | L | 2-1 |
| England U23 Development League | 2020/09/22 12:00 | Cardiff U23 v Bristol City U23 | L | 1-2 |
| England U23 Development League | 2020/09/14 12:00 | Swansea U23 v Cardiff U23 | L | 5-1 |
| England U23 Development League | 2020/03/12 14:00 | Charlton U23 v Cardiff U23 | L | 2-1 |
| England U23 Development League | 2020/03/09 13:00 | Cardiff U23 v Ipswich U23 | D | 1-1 |