Willem II (Eredivisie): every transfer in and out, fees paid and earned, squad market value, €6.4m spent and €4.8m earned. Tracked squad: ACTUAL Value €9.1m, in line with the market. Valued as of 2026-08-26.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-08-17 | Calvin Twigt | Go Ahead Eagles | Willem II | €800k |
| 2026-07-28 | Hidde ter Avest | Oxford United | Willem II | Free |
| 2026-07-23 | Mats Lemmens | RWDM Brussels | Willem II | Free |
| 2026-07-23 | Kasper Boogaard | AZ Alkmaar | Willem II | Loan |
| 2026-07-23 | Siegert Baartmans | Willem II | FC Eindhoven | Loan |
| 2026-07-21 | Eser Gürbüz | SC Heerenveen | Willem II | Loan |
| 2026-07-07 | Jaden Slory | Feyenoord Rotterdam | Willem II | Loan |
| 2026-07-01 | Finn Stam | Jong AZ | Willem II | Free |
| 2026-07-01 | Boris Lambert | Willem II | KV Kortrijk | Free |
| 2026-07-01 | Raffael Behounek | Willem II | Wolfsberger AC | Free |
| 2026-07-01 | Nick Doodeman | Willem II | FC Volendam | Free |
| 2026-07-01 | Emilio Kehrer | Willem II | FC Winterthur | Free |
| 2026-02-03 | Calvin Twigt | Go Ahead Eagles | Willem II | Loan |
| 2026-01-21 | Amine Et-Taïbi | KV Mechelen | Willem II | €650k |
| 2026-01-15 | Niels van Berkel | Willem II | FC Eindhoven | Free |
| 2025-09-01 | Alessandro Ciranni | SCM Gloria Buzau | Willem II | Free |
| 2025-08-30 | Armin Culum | Trelleborg | Willem II | Free |
| 2025-08-29 | Samuel Bamba | VfL Bochum | Willem II | Loan |
| 2025-08-29 | Anass Zarrouk | Vitesse FC | Willem II | Free |
| 2025-08-19 | Erik Schouten | Willem II | Terrassa | Free |