| 4. Round | 21/08/2019 | Fulham FC | - | Millwall FC | 4:0 | ||||
| 17. Round | 23/11/2019 | Swansea City | - | Millwall FC | 0:1 |  |
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| 18. Round | 26/11/2019 | Millwall FC | - | Wigan Athletic | 2:2 | ||||
| 19. Round | 30/11/2019 | Birmingham City | - | Millwall FC | 1:1 | ||||
| 20. Round | 06/12/2019 | Millwall FC | - | Nottingham Forest | 2:2 | ||||
| 23. Round | 21/12/2019 | Millwall FC | - | Barnsley FC | 1:2 | ||||
| 25. Round | 29/12/2019 | Millwall FC | - | Brentford FC | 1:0 | ||||
| 32. Round | 12/02/2020 | Millwall FC | - | Fulham FC | 1:1 | ||||
| 38. Round | 20/06/2020 | Millwall FC | - | Derby County | 2:3 | ||||
| 39. Round | 27/06/2020 | Barnsley FC | - | Millwall FC | 0:0 | ||||
| 43. Round | 11/07/2020 | Hull City | - | Millwall FC | 0:1 | ||||
| 46. Round | 22/07/2020 | Millwall FC | - | Huddersfield Town | 4:1 |  |
Czech Republic