| 2. Round | 25/10/2020 | Club Portugalete | - | SD Amorebieta | 0:0 | ||||
| 3. Round | 01/11/2020 | Club Portugalete | - | Athletic Club B | 2:3 | ||||
| 4. Round | 07/11/2020 | CD Alavés B | - | Club Portugalete | 1:0 | ||||
| 5. Round | 15/11/2020 | Club Portugalete | - | SD Leioa | 1:0 |  |
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| 7. Round | 29/11/2020 | Club Portugalete | - | CD Laredo | 0:1 | ||||
| 9. Round | 12/12/2020 | Club Portugalete | - | Real Sociedad B | 1:1 | ||||
| 13. Round | 23/01/2021 | SD Amorebieta | - | Club Portugalete | 2:1 |
Spain