Athletic: every transfer in and out, fees paid and earned, squad market value and €6.7m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-07-28 | Gabriel Queiroz | Athletic | SL Benfica | €4m |
| 2026-07-28 | João Adriano | Athletic | Gandzasar | Free |
| 2026-07-25 | Ruan Assis | Athletic | Avs Futebol | Free |
| 2026-07-23 | Jhonatan | Athletic | FC Alverca | Free |
| 2026-07-21 | Leandro Silva | Athletic | Mafra | Free |
| 2026-07-20 | Yarlen | Botafogo | Athletic | Free |
| 2026-07-20 | Felipe Negrucci | São Paulo Futebol Clube | Athletic | Loan |
| 2026-07-15 | Carlinhos | Clube de Regatas do Flamengo | Athletic | Loan |
| 2026-03-27 | David Braga | Athletic | Remo | — |
| 2026-03-27 | David Braga | Athletic | Clube do Remo | Free |
| 2026-03-26 | Chico Geraldes | Athletic | Seoul E. | Free |
| 2026-03-02 | Wesley Gasolina | Athletic | Avaí FC | Free |
| 2026-03-01 | Léo Chú | FC Alverca | Athletic | Loan |
| 2026-02-27 | Lucas Belezi | Athletico Paranaense | Athletic | Free |
| 2026-02-27 | Wesley Gasolina | Athletic | Avaí FC | Free |
| 2026-02-26 | Diogo Batista | Coritiba Foot Ball Club | Athletic | Free |
| 2026-02-26 | Lucas Belezi | Athletico Paranaense | Athletic | Free |
| 2026-02-26 | Nestor Caicedo | Athletic | Leones FC | Free |
| 2026-01-28 | Kauan Rodrigues | Fortaleza Esporte Clube | Athletic | Loan |
| 2026-01-28 | Alessio Da Cruz | Athletic | Anorthosis | Free |