Millwall: every transfer in and out, fees paid and earned, squad market value, €8.4m spent and €31m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-02-01 | Tom Watson | Brighton | Millwall | Loan |
| 2025-09-01 | Will Smallbone | Southampton | Millwall | Loan |
| 2025-09-01 | Thierno Ballo | Wolfsberger AC | Millwall | Loan |
| 2025-09-01 | Kevin Nisbet | Millwall | Aberdeen FC | €346k |
| 2025-07-25 | Steven Benda | Fulham | Millwall | Loan |
| 2025-07-25 | Massimo Luongo | Ipswich | Millwall | Free |
| 2025-07-01 | Zian Flemming | Millwall | Burnley | €8.3m |
| 2025-07-01 | Max Crocombe | Burton Albion | Millwall | Free |
| 2025-07-01 | George Saville | Millwall | Luton | Free |
| 2025-01-31 | Luke Cundle | Wolves | Millwall | €1.2m |
| 2025-01-18 | Romain Esse | Millwall | Crystal Palace | €14m |
| 2024-08-30 | Zian Flemming | Millwall | Burnley | Loan |
| 2024-08-24 | Kevin Nisbet | Millwall | Aberdeen FC | Loan |
| 2024-07-10 | Japhet Tanganga | Tottenham | Millwall | Free |
| 2024-01-23 | Michael Obafemi | Burnley | Millwall | Loan |
| 2024-01-18 | Japhet Tanganga | Tottenham | Millwall | Loan |
| 2023-09-01 | Allan Campbell | Luton | Millwall | Loan |
| 2023-08-24 | Brooke Norton-Cuffy | Arsenal U21 | Millwall | Loan |
| 2023-08-16 | Tyler Burey | Millwall | Odense BK | €670k |
| 2023-07-01 | Romain Esse | Millwall U18 | Millwall | — |