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| Player (age) | From club | To club | Date | Fee | |||
|---|---|---|---|---|---|---|---|
| Fees in euro (EUR) | |||||||
| 1 |  |  C. Goode (25) |  Northampton Town |  FC Brentford | 2020, Aug | 1 100 000 | |
| 2 | | I. Toney (19) | Northampton Town |  Newcastle | 2015, Aug | 710 000 | |
| 3 | | B. Johnson (20) | Northampton Town |  Leeds | 2008, Jan | 280 000 | |
| 4 | | D. Galbraith (22) | Northampton Town | 2006, Jan | 200 000 | ||
| 5 | | M. Bunn (23) | Northampton Town |  Blackburn | 2008, Aug | 150 000 | |
| 6 | | D. Jackman (26) | Northampton Town |  FC Gillingham | 2009, Aug | 90 000 | |
| 7 | |  S. Howard (24) | Northampton Town |  Luton Town | 2001, Mar | 80 000 | |
| 8 | |  T. Benjamin (26) | Northampton Town |  Coventry | 2005, Feb | 50 000 | |
| 9 | | B. Richardson (24) | Northampton Town |  Preston North End | 1994, Jul | 30 000 | |
| 10 | |  T. King (28) | Northampton Town |  Wolverhampton | 2023, Jul | ||