Face à face
| England U23 Development League | 2021/09/27 12:00 | Cardiff City v Millwall | L | 2-0 |
| England U23 Development League | 2021/02/16 13:00 | Cardiff City v Millwall | L | 3-0 |
| England U23 Development League | 2020/11/25 11:00 | Millwall v Cardiff City | W | 2-0 |
| England U23 Development League | 2020/02/03 14:00 | Millwall v Cardiff City | W | 3-0 |
| England U23 Development League | 2019/10/07 12:00 | Cardiff City v Millwall | L | 2-1 |
| England U23 Development League | 2019/02/18 13:31 | Millwall v Cardiff City | L | 0-1 |
| England U23 Development League | 2018/09/24 11:57 | Cardiff City v Millwall | D | 2-2 |
| England U23 Development League | 2018/01/08 11:58 | Cardiff City v Millwall | D | 1-1 |
Home History
| England U23 Development League | 2021/11/30 13:30 | Millwall v Bristol City | D | 1-1 |
| England U23 Development League | 2021/11/22 13:00 | Ipswich Town v Millwall | D | 4-4 |
| England U23 Development League | 2021/11/08 19:00 | Colchester v Millwall | L | 2-0 |
| England U23 Development League | 2021/11/02 13:30 | Millwall v Watford | W | 2-1 |
| England U23 Development League | 2021/10/22 13:00 | Charlton Athletic v Millwall | L | 2-1 |
| England U23 Development League | 2021/10/19 12:30 | Millwall v Swansea City U21 | W | 3-1 |
| England U23 Development League | 2021/10/01 12:00 | Millwall v Queens Park | W | 3-1 |
| England U23 Development League | 2021/09/27 12:00 | Cardiff City v Millwall | L | 2-0 |
Away History
| England U23 Development League | 2021/12/06 13:00 | Cardiff City v Watford | W | 4-0 |
| England U23 Development League | 2021/11/30 13:00 | Cardiff City v Colchester | W | 2-0 |
| England U23 Development League | 2021/11/23 13:30 | Queens Park v Cardiff City | W | 1-3 |
| England U23 Development League | 2021/11/01 19:00 | Swansea City U21 v Cardiff City | W | 1-3 |
| England U23 Development League | 2021/10/26 11:00 | Ipswich Town v Cardiff City | W | 1-2 |
| England U23 Development League | 2021/10/19 12:00 | Cardiff City v Charlton Athletic | W | 4-1 |
| England U23 Development League | 2021/09/27 12:00 | Cardiff City v Millwall | W | 2-0 |
| England U23 Development League | 2021/09/21 12:00 | Cardiff City v Sheff Utd | W | 2-0 |