| 1. Round | 18/10/2020 | Racing Santander | - | Club Portugalete | 1:1 | ||||
| 2. Round | 25/10/2020 | Club Portugalete | - | SD Amorebieta | 0:0 | ||||
| 5. Round | 15/11/2020 | Club Portugalete | - | SD Leioa | 1:0 | ||||
| 7. Round | 29/11/2020 | Club Portugalete | - | CD Laredo | 0:1 | ||||
| 11. Round | 10/01/2021 | Club Portugalete | - | Arenas de Getxo | 0:1 | ||||
| 12. Round | 16/01/2021 | Club Portugalete | - | Racing Santander | 0:1 | ||||
| 13. Round | 23/01/2021 | SD Amorebieta | - | Club Portugalete | 2:1 |  |
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| 14. Round | 30/01/2021 | Athletic Club B | - | Club Portugalete | 2:0 | |
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| 18. Round | 28/02/2021 | CD Laredo | - | Club Portugalete | 0:1 | ||||
| 19. Round | 06/03/2021 | Club Portugalete | - | Barakaldo CF | 2:0 |
Spain