3. Round | 01/11/2020 | Club Portugalete | - | Athletic Bilbao B | 2:3 | ||||
4. Round | 07/11/2020 | Athletic Bilbao B | - | SD Amorebieta | 2:1 | ||||
8. Round | 05/12/2020 | CD Laredo | - | Athletic Bilbao B | 2:2 | ||||
10. Round | 19/12/2020 | Real Sociedad B | - | Athletic Bilbao B | 1:2 | ||||
11. Round | 10/01/2021 | Athletic Bilbao B | - | Real Unión | 0:0 | ||||
12. Round | 16/01/2021 | Athletic Bilbao B | - | Arenas de Getxo | 1:1 | ||||
13. Round | 24/01/2021 | Racing Santander | - | Athletic Bilbao B | 1:1 | ||||
14. Round | 30/01/2021 | Athletic Bilbao B | - | Club Portugalete | 2:0 | ||||
15. Round | 06/02/2021 | SD Amorebieta | - | Athletic Bilbao B | 2:3 | ||||
16. Round | 14/02/2021 | CD Alavés B | - | Athletic Bilbao B | 0:2 | ||||
19. Round | 06/03/2021 | Athletic Bilbao B | - | CD Laredo | 2:1 | ||||
22. Round | 28/03/2021 | Real Unión | - | Athletic Bilbao B | 0:1 |