| Florian Lejeune | Newcastle United | 04-07-2017 | 10M € |
| Alexander Mesa Travieso | Levante | 01-09-2017 | Loan |
| Antonio Manuel Luna Rodriguez | Levante | 01-07-2017 | Free |
| Unai Elgezabal Udondo | Numancia | 16-08-2017 | Loan |
| Pere Milla Pena | Numancia | 06-07-2017 | Loan |
| Jordi Calavera Espinach | Sporting Gijon | 29-08-2017 | Loan |
| Pablo Hervias Ruiz | Real Valladolid | 12-07-2017 | Loan |
| Adrian Gonzalez Morales | Malaga | 01-07-2017 | Free |
| Thaylor Lubanzadio | Caudal | 31-08-2017 | Unknown |
| Juanfran | Marbella | 28-08-2017 | Unknown |
| Aitor Ortega | Amorebieta | 17-08-2017 | Unknown |
| Jon Ander | Toledo | 19-07-2017 | Unknown |
| M. Dos Santos | Leganés | 11-07-2017 | Free |
| Ander Gayoso | Real Union | 10-07-2017 | Unknown |
| Sergio García | Barakaldo | 08-07-2017 | Unknown |
| Jorge Mediavilla | Amorebieta | 03-02-2017 | Free |
| Jon Ander | Llagostera | 31-01-2017 | Loan |
| Thaylor Lubanzadio | Real Union | 13-01-2017 | Loan |
| Jose Ignacio Peleteiro Ramallo | Brentford | 01-01-2017 | Unknown |
| Ander Capa Rodriguez | Athletic Bilbao | 01-07-2018 | 3M € |
| Francisco Manuel Rico Castro | Granada | 01-07-2018 | Unknown |
| Alejandro Galvez Jimena | Las Palmas | 01-01-2018 | Loan |
| Christian Rivera Hernandez | Barcelona | 11-01-2018 | Loan |
| Alexander Mesa Travieso | Sporting Gijon | 31-01-2018 | Loan |
| Tiago Manuel Dias Correia | Rayo Vallecano | 31-01-2018 | Loan |
| Takashi Inui | Real Betis | 02-07-2018 | Free |
| David Junca Rene | Celta Vigo | 02-07-2018 | Free |
| Daniel Garcia Carrillo | Athletic Bilbao | 02-07-2018 | Free |
| Julen Azkue Unzueta | Arenas Getxo | 01-07-2018 | Unknown |
| Christian Rivera Hernandez | Las Palmas | 31-07-2018 | Free |
| Jose Antonio Martinez Gil | Granada | 30-07-2018 | Loan |
| Ivan Alejo Peralta | Getafe | 26-07-2018 | 4M € |
| Alexander Mesa Travieso | Tenerife | 06-08-2018 | Loan |
| Unai Elgezabal Udondo | Alcorcon | 15-08-2018 | Loan |
| Yoel Rodriguez Oterino | Real Valladolid | 30-08-2018 | Loan |
| Alejandro Galvez Jimena | Rayo Vallecano | 31-08-2018 | Unknown |
| Iñigo Barrenetxea | Lorca FC | 06-08-2018 | Unknown |
| Corral | Balmaseda | 01-07-2018 | Unknown |
| Pedro Bigas Rigo | Las Palmas | 01-07-2019 | Unknown |
| Joan Jordan Moreno | Sevilla | 01-07-2019 | 14M € |
| Pere Milla Pena | Elche | 01-07-2019 | Free |
| Ruben Pena Jimenez | Villarreal | 04-07-2019 | Unknown |
| Marc Cucurella Saseta | Barcelona | 16-07-2019 | € 4M |
| Roberto Olabe del Arco | Albacete | 04-08-2019 | Loan |
| Asier Benito | Ponferradina | 07-08-2019 | Loan |
| Alexander Mesa Travieso | Cadiz | 13-08-2019 | Loan |
| Jordi Calavera Espinach | Girona | 20-08-2019 | Loan |
| Angel Lopez Perez | Talavera | 30-07-2019 | Unknown |
| Asier Riesgo Unamuno | Girona | 02-09-2019 | Free |
| Roger Escoruela | Sant Andreu | 01-07-2019 | Free |
| Ekhi Bravo | EC Vitoria | 28-07-2019 | Unknown |
| Markel Areitio Cedrun | Izarra | 03-01-2020 | Free |
| Roberto Olabe del Arco | Extremadura | 22-01-2020 | Loan |
| Fabian Ariel Orellana Valenzuela | Real Valladolid | 04-08-2020 | Unknown |
| Julen Lopez Salas | Barakaldo | 04-08-2020 | Free |
| Charles Dias Barbosa de Oliveira | Pontevedra | 04-08-2020 | Unknown |
| Gonzalo Escalante | Lazio | 01-09-2020 | Free |
| Asier Benito | Numancia | 12-09-2020 | Loan |
| Alvaro Tejero Sacristan | Real Zaragoza | 05-10-2020 | Loan |
| Miguel Marí | Orihuela | 06-09-2020 | Loan |
| Alberto Mari | EC Vitoria | 01-07-2020 | Unknown |
| Roberto Olabe del Arco | Tondela | 17-01-2021 | Loan |
| Pablo Ezequiel De Blasis | Cartagena | 15-01-2021 | Unknown |
| Damian Kadzior | Alanyaspor | 19-01-2021 | Loan |
| Enrique Garcia Martinez | Osasuna | 01-07-2021 | Unknown |
| Asier Benito | Asteras Tripoli | 11-06-2021 | Unknown |
| Paulo Andre Rodrigues de Oliveira | Braga | 01-07-2021 | Free |
| Marko Dmitrovic | Sevilla | 04-07-2021 | Free |
| Jose Angel Valdes Diaz | Osasuna | 05-07-2021 | Free |
| Damian Kadzior | Piast Gliwice | 19-07-2021 | € 500K |
| Pedro Leon Sanchez Gil | Fuenlabrada | 01-08-2021 | Free |
| Unai Dufur | Osasuna | 01-07-2021 | Free |
| Papa Kouly Diop | Ibiza | 20-08-2021 | Free |
| Sergio Cubero | SD Logroñés | 31-08-2021 | Loan |
| Takashi Inui | Cerezo Osaka | 31-08-2021 | Free |
| Sergio Enrich Ametller | Ponferradina | 22-09-2021 | Free |
| Roberto Olabe del Arco | Alcorcon | 31-01-2022 | Loan |
| Esteban Rodrigo Burgos | Malaga | 15-07-2022 | Free |
| Roberto Olabe del Arco | Deportivo La Coruna | 07-07-2022 | Unknown |
| Óscar Sielva | Huesca | 06-08-2022 | Unknown |
| Eduardo Exposito Jaen | Espanyol | 08-08-2022 | £ 4.1M |
| Miguel Atienza | Burgos | 08-07-2022 | Unknown |
| Sergio Cubero | Fuenlabrada | 16-08-2022 | Loan |
| J. Yriarte | Amorebieta | 09-08-2022 | Loan |
| Paul Álvarez | Arenas Getxo | 01-07-2022 | Unknown |
| Antonio Cristian Glauder Garcia | Albacete | 31-08-2022 | Free |
| Xabier Etxeita Gorritxategi | Amorebieta | 08-09-2022 | Free |
| Francisco Feuillassier Abalo | Cartagena | 28-07-2022 | Loan |
| Javi Muñoz | Las Palmas | 01-07-2023 | Free |
| Sergio Cubero | Racing Ferrol | 07-08-2023 | Loan |
| Daniel Lasure Briz | Amorebieta | 04-07-2023 | Free |
| Ander Cantero Armendariz | Racing Ferrol | 09-08-2023 | Free |
| Jose Manuel Rodriguez Benito | Alcorcon | 13-08-2023 | Loan |
| Juan Carlos Arana | Racing Santander | 29-08-2023 | Loan |
| Francisco Feuillassier Abalo | Diosgyori VTK | 16-09-2023 | Free |
| Gustavo Ezequiel Blanco Leschuk | Esteghlal | 01-09-2023 | Free |
| Unai Vencedor | Athletic Bilbao | 30-06-2024 | Unknown |
| Y. Rahmani | Tenerife | 14-01-2024 | Loan |
| Ángel Troncho | Amorebieta | 18-01-2024 | Loan |