| Professional Development League | - | 2024-05-03 21:00 | Millwall U21 | | Wigan Athletic U21 | |
| Professional Development League | - | 2024-04-30 21:00 | Peterborough United U21 | | Millwall U21 | |
| Professional Development League | - | 2024-04-23 21:00 | Millwall U21 | 3-3 | Barnsley U21 | 1-3 |
| Professional Development League | - | 2024-04-18 20:00 | Fleetwood Town U21 | 2-3 | Millwall U21 | 1-1 |
| Professional Development League | - | 2024-04-09 20:00 | Millwall U21 | 6-0 | Coventry City U21 | 2-0 |
| Professional Development League | - | 2024-03-27 01:00 | Sheffield United U21 | 0-3 | Millwall U21 | 0-3 |
| Professional Development League | - | 2024-03-15 22:00 | Colchester United U21 | 2-3 | Millwall U21 | 0-1 |
| Professional Development League | - | 2024-03-11 22:00 | Millwall U21 | 7-0 | Watford U21 | 5-0 |
| Professional Development League | - | 2024-03-06 03:00 | Queens Park Rangers U21 | 2-1 | Millwall U21 | 2-0 |
| Professional Development League | - | 2024-03-01 22:00 | Millwall U21 | 4-1 | Swansea City U21 | 0-1 |
| Professional Development League | - | 2024-02-27 22:00 | Millwall U21 | 2-1 | Ipswich Town U21 | 1-0 |
| Professional Development League | - | 2024-02-20 21:00 | Bristol City U21 | 1-1 | Millwall U21 | 0-1 |
| Professional Development League | - | 2024-02-12 21:30 | Millwall U21 | 2-2 | Colchester United U21 | 1-0 |
| Professional Development League | - | 2024-01-30 21:00 | AFC Bournemouth U21 | 2-3 | Millwall U21 | 1-1 |
| Professional Development League | - | 2024-01-08 22:00 | Swansea City U21 | 3-0 | Millwall U21 | 2-0 |
| Professional Development League | - | 2024-01-04 21:30 | Millwall U21 | 1-6 | Charlton Athletic U21 | 1-1 |
| Professional Development League | - | 2023-12-18 21:30 | Millwall U21 | 5-1 | Cardiff City U21 | 2-1 |
| Professional Development League | - | 2023-12-11 21:00 | Watford U21 | 1-3 | Millwall U21 | 1-2 |
| Professional Development League | - | 2023-11-27 21:30 | Millwall U21 | 5-1 | Bristol City U21 | 4-1 |
| Professional Development League | - | 2023-11-21 21:00 | Ipswich Town U21 | 1-1 | Millwall U21 | 0-1 |
| Professional Development League | - | 2023-10-30 21:30 | Millwall U21 | 1-2 | AFC Bournemouth U21 | 1-1 |
| Professional Development League | - | 2023-10-16 20:00 | Charlton Athletic U21 | 2-3 | Millwall U21 | 1-2 |
| Professional Development League | - | 2023-10-03 21:00 | Millwall U21 | 2-2 | Queens Park Rangers U21 | 0-1 |
| Professional Development League | - | 2023-09-26 21:00 | Cardiff City U21 | 0-1 | Millwall U21 | 0-1 |
| Professional Development League | - | 2023-09-11 21:00 | Birmingham City U21 | 3-3 | Millwall U21 | 1-1 |
| Professional Development League | - | 2023-09-04 21:00 | Millwall U21 | 2-0 | Crewe Alexandra U21 | 1-0 |
| Professional Development League | - | 2023-08-30 20:00 | Hull City U21 | 2-3 | Millwall U21 | 1-1 |
| Professional Development League | - | 2023-08-21 21:00 | Millwall U21 | 3-1 | Burnley U21 | 1-1 |
| Professional Development League | - | 2023-08-15 21:00 | Sheffield Wednesday U21 | 2-2 | Millwall U21 | 0-1 |
| Professional Development League | - | 2023-05-23 02:00 | Millwall U21 | 1-1 | Sheffield United U21 | 1-0 |
| Professional Development League | - | 2023-05-15 21:00 | Millwall U21 | 3-3 | Hull City U21 | 1-2 |
| Professional Development League | - | 2023-05-05 19:30 | Millwall U21 | 3-0 | Sheffield Wednesday U21 | 1-0 |
| Professional Development League | - | 2023-04-28 19:00 | Wigan Athletic U21 | 2-3 | Millwall U21 | 2-1 |
| Professional Development League | - | 2023-04-25 21:00 | Millwall U21 | 5-0 | Crewe Alexandra U21 | 2-0 |
| Professional Development League | - | 2023-04-18 20:00 | Sheffield United U21 | 1-1 | Millwall U21 | 1-1 |
| Professional Development League | - | 2023-04-11 19:00 | Millwall U21 | 3-1 | Swansea City U21 | 2-0 |
| Professional Development League | - | 2023-04-03 20:30 | Millwall U21 | | Burnley U21 | |
| Professional Development League | - | 2023-03-21 22:00 | Colchester United U21 | 1-2 | Millwall U21 | 1-1 |
| Professional Development League | - | 2023-03-07 21:00 | Bristol City U21 | 0-0 | Millwall U21 | 0-0 |
| Professional Development League | - | 2023-02-27 21:30 | Millwall U21 | 2-1 | Reading U21 | 0-1 |
| Professional Development League | - | 2023-02-21 20:00 | Cardiff City U21 | 4-2 | Millwall U21 | 1-1 |
| Professional Development League | - | 2023-02-17 08:00 | Ipswich Town U21 | 0-1 | Millwall U21 | 0-0 |
| Professional Development League | - | 2023-02-14 21:30 | Millwall U21 | 1-1 | Watford U21 | 1-1 |
| Professional Development League | - | 2023-02-07 21:30 | Millwall U21 | 2-2 | Queens Park Rangers U21 | 0-2 |
| Professional Development League | - | 2023-01-30 21:00 | Charlton Athletic U21 | 3-3 | Millwall U21 | 2-1 |
| Professional Development League | - | 2022-12-05 20:00 | Millwall U21 | 3-3 | Ipswich Town U21 | 1-3 |
| Professional Development League | - | 2022-11-08 21:15 | Millwall U21 | 4-1 | Colchester United U21 | 2-1 |
| Professional Development League | - | 2022-10-31 22:00 | Millwall U21 | 5-0 | Cardiff City U21 | 1-0 |
| Professional Development League | - | 2022-10-24 21:00 | Swansea City U21 | 2-0 | Millwall U21 | 1-0 |
| Professional Development League | - | 2022-10-11 20:00 | Queens Park Rangers U21 | 1-2 | Millwall U21 | 1-0 |
| Professional Development League | - | 2022-10-03 21:00 | Millwall U21 | 1-1 | Bristol City U21 | 1-1 |
| Professional Development League | - | 2022-09-26 21:00 | Reading U21 | 2-1 | Millwall U21 | 1-0 |
| Professional Development League | - | 2022-09-20 21:00 | Millwall U21 | 4-1 | Charlton Athletic U21 | 1-1 |
| Professional Development League | - | 2022-09-13 20:00 | Watford U21 | 1-4 | Millwall U21 | 1-2 |
| Professional Development League | - | 2022-09-06 20:00 | Coventry City U21 | 2-3 | Millwall U21 | 1-0 |
| Professional Development League | - | 2022-08-31 20:00 | Millwall U21 | 5-1 | Peterborough United U21 | 1-1 |
| Professional Development League | - | 2022-08-22 20:30 | Birmingham City U21 | 1-4 | Millwall U21 | 0-1 |
| Professional Development League | - | 2022-08-16 20:00 | Millwall U21 | 4-0 | Barnsley U21 | 2-0 |
| Professional Development League | - | 2022-08-09 02:00 | Hull City U21 | 0-1 | Millwall U21 | 0-1 |
