| 1. Round | 03/08/2019 | Millwall FC | - | Preston North End | 1:0 | ||||
| 3. Round | 17/08/2019 | Millwall FC | - | Sheffield Wednesday | 1:0 | ||||
| 5. Round | 24/08/2019 | Middlesbrough FC | - | Millwall FC | 1:1 |  |
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| 6. Round | 31/08/2019 | Millwall FC | - | Hull City | 1:1 | ||||
| 8. Round | 21/09/2019 | Millwall FC | - | Queens Park Rangers | 1:2 | ||||
| 9. Round | 28/09/2019 | Huddersfield Town | - | Millwall FC | 1:1 | ||||
| 10. Round | 02/10/2019 | Luton Town | - | Millwall FC | 1:1 | ||||
| 13. Round | 22/10/2019 | Millwall FC | - | Cardiff City | 2:2 | ||||
| 16. Round | 09/11/2019 | Millwall FC | - | Charlton Athletic | 2:1 | ||||
| 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 |  |
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| 22. Round | 14/12/2019 | Derby County | - | Millwall FC | 0:1 | ||||
| 23. Round | 21/12/2019 | Millwall FC | - | Barnsley FC | 1:2 | |
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| 25. Round | 29/12/2019 | Millwall FC | - | Brentford FC | 1:0 | |
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| 26. Round | 01/01/2020 | Millwall FC | - | Luton Town | 3:1 | ||||
| 31. Round | 09/02/2020 | Millwall FC | - | West Bromwich Albion | 0:2 | ||||
| 36. Round | 29/02/2020 | Millwall FC | - | Bristol City | 1:1 |
England