11. Round | 09/01/2021 | CD Alavés B | - | Real Sociedad B | 0:1 | ||||
12. Round | 16/01/2021 | SD Leioa | - | Real Sociedad B | 1:1 | ||||
14. Round | 31/01/2021 | CD Laredo | - | Real Sociedad B | 0:0 | ||||
15. Round | 07/02/2021 | Real Sociedad B | - | Barakaldo CF | 2:0 | ||||
16. Round | 13/02/2021 | Real Sociedad B | - | SD Amorebieta | 2:1 | ||||
17. Round | 20/02/2021 | Real Unión | - | Real Sociedad B | 3:1 | ||||
18. Round | 28/02/2021 | Real Sociedad B | - | Arenas de Getxo | 3:0 | ||||
20. Round | 14/03/2021 | Real Sociedad B | - | Club Portugalete | 2:0 | ||||
21. Round | 21/03/2021 | Athletic Bilbao B | - | Real Sociedad B | 1:2 | ||||
22. Round | 28/03/2021 | Real Sociedad B | - | CD Alavés B | 4:1 |