Transfers
Recent player movements in and out of the squad
| Date | Player | From | To | Type |
|---|---|---|---|---|
| 31.01.2013 | Sergio Mendigutxia | Athletic Club | — | Free |
| 29.01.2013 | Aitor Fernández | Athletic Club | Villarreal | Free |
| 28.01.2013 | Aitor Fernández | Athletic Club | Athletic Club | N/A |
| 31.08.2012 | David López | Athletic Club | Brighton | Free |
| 31.08.2012 | Jon Koldo Iruarrizaga Arteche | Athletic Club | — | Loan |
| 31.08.2012 | Mikel Orbegozo | Athletic Club | — | Loan |
| 31.08.2012 | Galder Cerrajería | Athletic Club | Oviedo | Loan |
| 29.08.2012 | Javi Martínez | Athletic Club | Bayern München | € 40M |
| 17.08.2012 | Igor Arnáez | Athletic Club | — | Loan |
| 01.08.2012 | Iago Herrerín | Athletic Club | — | Loan |
| 23.07.2012 | Aitor Fernández | Athletic Club | — | Loan |
| 11.07.2012 | Aitor Etxebarriazarraga Gabiola | Athletic Club | — | Loan |
| 06.07.2012 | Koikili | Athletic Club | — | Free |
| 05.07.2012 | Unai Medina | Athletic Club | — | N/A |
| 01.07.2012 | Iago Herrerín | Atletico Madrid | Athletic Club | Free |
| 01.07.2012 | Ander Larrucea Arrien | Athletic Club | — | Free |
| 01.07.2012 | Igor Arnáez | — | Athletic Club | N/A |
| 01.07.2012 | Aduriz | Valencia | Athletic Club | € 2.5M |
| 01.07.2012 | Xabier Galán | Athletic Club | Osasuna | Free |
| 01.07.2012 | Gorka Magunazelaia | — | Athletic Club | N/A |
| 01.07.2012 | Jon Etxaniz | — | Athletic Club | N/A |
| 01.07.2012 | Unai Bilbao | — | Athletic Club | N/A |
| 20.06.2012 | Ander Larrucea Arrien | — | Athletic Club | N/A |
| 30.01.2012 | Ander Larrucea Arrien | Athletic Club | — | Loan |
| 09.01.2012 | Mikel Orbegozo | Athletic Club | — | Loan |
| 07.12.2011 | Igor Arnáez | Athletic Club | — | Loan |
| 30.08.2011 | Urko Vera Mateos | Athletic Club | — | Free |
| 19.08.2011 | Galder Cerrajería | Athletic Club | — | Loan |
| 10.08.2011 | Jon Etxaniz | Athletic Club | — | Loan |
| 05.08.2011 | Balenziaga | Athletic Club | Valladolid | Loan |
| 01.08.2011 | Eneko Bóveda Altube | Athletic Club | — | Free |
| 01.08.2011 | Urtzi Iturrioz Urkiza | Athletic Club | — | N/A |
| 01.08.2011 | Mikel Orbegozo | Athletic Club | — | N/A |
| 01.08.2011 | Isma López | Athletic Club | — | Loan |
| 01.08.2011 | Jon Villanueva | Athletic Club | Valladolid | N/A |
| 25.07.2011 | Ion Vélez Martínez | Athletic Club | Girona | Free |
| 09.07.2011 | Mikel Santamaría | Athletic Club | — | N/A |
| 01.07.2011 | Iñigo Pérez | — | Athletic Club | N/A |
| 01.07.2011 | Ander Larrucea Arrien | — | Athletic Club | N/A |
| 01.07.2011 | Ion Vélez Martínez | — | Athletic Club | N/A |
| 01.07.2011 | Asier Goti | — | Athletic Club | N/A |
| 01.07.2011 | Alain Eizmendi | Real Sociedad | Athletic Club | Loan |
| 01.07.2011 | Ander Herrera | — | Athletic Club | € 7.5M |
| 10.03.2011 | Iñigo Pérez | Athletic Club | — | Loan |
| 01.02.2011 | Adrien Goñi | Athletic Club | Girona | N/A |
| 20.01.2011 | Ion Vélez Martínez | Athletic Club | — | Loan |
| 10.11.2010 | Iago Herrerín | Athletic Club | Atletico Madrid | Free |
| 20.08.2010 | Beñat | Athletic Club | Real Betis | Free |
| 12.08.2010 | Ander Murillo García | Athletic Club | Celta Vigo | N/A |
| 01.08.2010 | Isma López | Athletic Club | — | Loan |