| Championship | 13/03/21 | Derby County | - | Millwall FC | 0:1 | ||||
| Championship | 06/11/21 | Millwall FC | - | Derby County | 1:1 |  |
|||
| Championship | 23/02/22 | Derby County | - | Millwall FC | 1:2 | ||||
| Championship | 22/02/25 | Derby County | - | Millwall FC | 0:1 |
| Championship | 13/03/21 | Derby County | - | Millwall FC | 0:1 | ||||
| Championship | 06/11/21 | Millwall FC | - | Derby County | 1:1 | |
|||
| Championship | 23/02/22 | Derby County | - | Millwall FC | 1:2 | ||||
| Championship | 22/02/25 | Derby County | - | Millwall FC | 0:1 |
| Billy James Mitchell | |
| Born: | 07.04.2001 |
| Place of birth: |
Orpington, London, 
England |
| Nationality: |
England
|
| Height: | 178 cm |
| Weight: | 71 kg |
| Position(s): | Defensive Midfielder Central Midfielder |
| Foot: | right |