1. Round | 18/10/2020 | Arenas de Getxo | - | Athletic Bilbao B | 1:1 | ||||
3. Round | 01/11/2020 | Club Portugalete | - | Athletic Bilbao B | 2:3 | ||||
4. Round | 07/11/2020 | Athletic Bilbao B | - | SD Amorebieta | 2:1 | ||||
19. Round | 06/03/2021 | Athletic Bilbao B | - | CD Laredo | 2:1 | ||||
20. Round | 14/03/2021 | Barakaldo CF | - | Athletic Bilbao B | 3:1 | ||||
17. Round | 17/03/2021 | Athletic Bilbao B | - | SD Leioa | 4:0 | ||||
21. Round | 21/03/2021 | Athletic Bilbao B | - | Real Sociedad B | 1:2 | ||||
22. Round | 28/03/2021 | Real Unión | - | Athletic Bilbao B | 0:1 |