Debrecen: every transfer in and out, fees paid and earned, squad market value, €2.1m spent and €5.9m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-08-24 | Víctor Camarasa | Debrecen | Kitchee | Free |
| 2026-07-31 | Csanád Vilmos Dénes | KV Kortrijk | Debrecen | Free |
| 2026-07-20 | Ákos Szendrei | Paksi SE | Debrecen | Free |
| 2026-07-15 | Donát Bárány | Debrecen | ADO Den Haag | Free |
| 2026-07-15 | Álex Bermejo | Debrecen | Sant Andreu | Free |
| 2026-07-01 | Blaz Boskovic | NK Lokomotiva | Debrecen | Free |
| 2026-07-01 | Plamen Andreev | Feyenoord Rotterdam | Debrecen | Free |
| 2026-07-01 | Máté Macsó | Diósgyőr | Debrecen | €200k |
| 2026-07-01 | Rotem Keller | Maccabi Netanya | Debrecen | Free |
| 2026-07-01 | Sergi Samper | Motor Lublin Spółka Akcyjna | Debrecen | Free |
| 2026-07-01 | Sohan Baldoni | Concarneau | Debrecen | Free |
| 2026-07-01 | Dániel Póser | Békéscsaba | Debrecen | Free |
| 2026-07-01 | Yacouba Silue | Debrecen | OFK Beograd | — |
| 2026-07-01 | Soma Szuhodovszki | Debrecen | MTK Budapest | Free |
| 2026-07-01 | Patrik Demjén | Debrecen | MTK Budapest | Free |
| 2026-07-01 | Tamás Szűcs | Debrecen | FC Famalicão | Free |
| 2026-07-01 | Márk Engedi | Debrecen | Vasas FC | Free |
| 2026-02-06 | Yacouba Silue | Debrecen | OFK Beograd | Loan |
| 2026-01-28 | Patrik Demjén | MTK Budapest | Debrecen | — |
| 2025-09-04 | Jorgo Pellumbi | Debrecen | Drita | Free |