| 5. Round | 17/10/2020 | Wycombe Wanderers | - | Millwall FC | 1:2 | ||||
| 8. Round | 28/10/2020 | Preston North End | - | Millwall FC | 0:2 | ||||
| 10. Round | 03/11/2020 | Norwich City | - | Millwall FC | 0:0 | ||||
| 13. Round | 25/11/2020 | Millwall FC | - | Reading FC | 1:1 | ||||
| 16. Round | 05/12/2020 | Millwall FC | - | Derby County | 0:1 | ||||
| 18. Round | 12/12/2020 | Middlesbrough FC | - | Millwall FC | 3:0 | ||||
| 25. Round | 20/01/2021 | Huddersfield Town | - | Millwall FC | 0:1 | ||||
| 26. Round | 02/02/2021 | Millwall FC | - | Norwich City | 0:0 | ||||
| 30. Round | 17/02/2021 | Millwall FC | - | Birmingham City | 2:0 | ||||
| 31. Round | 20/02/2021 | Millwall FC | - | Wycombe Wanderers | 0:0 | ||||
| 33. Round | 27/02/2021 | Barnsley FC | - | Millwall FC | 2:1 | ||||
| 35. Round | 06/03/2021 | Millwall FC | - | Blackburn Rovers | 0:2 | ||||
| 36. Round | 13/03/2021 | Derby County | - | Millwall FC | 0:1 |
Northern Ireland