| 1. Round | 03/08/2019 | Millwall FC | - | Preston North End | 1:0 | ||||
| 2. Round | 10/08/2019 | West Bromwich Albion | - | Millwall FC | 1:1 | ||||
| 3. Round | 17/08/2019 | Millwall FC | - | Sheffield Wednesday | 1:0 | ||||
| 4. Round | 21/08/2019 | Fulham FC | - | Millwall FC | 4:0 | ||||
| 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 | ||||
| 7. Round | 14/09/2019 | Blackburn Rovers | - | Millwall FC | 2:0 | ||||
| 9. Round | 28/09/2019 | Huddersfield Town | - | Millwall FC | 1:1 | ||||
| 10. Round | 02/10/2019 | Luton Town | - | Millwall FC | 1:1 | ||||
| 11. Round | 05/10/2019 | Millwall FC | - | Leeds United | 2:1 | ||||
| 32. Round | 12/02/2020 | Millwall FC | - | Fulham FC | 1:1 | ||||
| 33. Round | 15/02/2020 | Preston North End | - | Millwall FC | 0:1 | ||||
| 38. Round | 20/06/2020 | Millwall FC | - | Derby County | 2:3 | ||||
| 41. Round | 03/07/2020 | Charlton Athletic | - | Millwall FC | 0:1 | ||||
| 43. Round | 11/07/2020 | Hull City | - | Millwall FC | 0:1 |  |
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| 44. Round | 14/07/2020 | Millwall FC | - | Blackburn Rovers | 1:0 | ||||
| 45. Round | 18/07/2020 | Queens Park Rangers | - | Millwall FC | 4:3 |
England