| 1. Round | 05/08/2023 | SR Delémont | - | FC St. Gallen II | 2:1 | ||||
| 2. Round | 12/08/2023 | FC St. Gallen II | - | Servette FC U21 | 4:2 |  |
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| 4. Round | 26/08/2023 | FC St. Gallen II | - | FC Lugano II | 1:1 | ||||
| 3. Round | 30/08/2023 | SC Brühl | - | FC St. Gallen II | 2:2 | ||||
| 5. Round | 03/09/2023 | FC Biel/Bienne | - | FC St. Gallen II | 1:1 | ||||
| 6. Round | 09/09/2023 | FC St. Gallen II | - | FC Basel 1893 II | 1:2 | ||||
| 7. Round | 16/09/2023 | FC Breitenrain Bern | - | FC St. Gallen II | 1:2 | ||||
| 8. Round | 23/09/2023 | FC St. Gallen II | - | FC Luzern II | 0:1 | ||||
| 9. Round | 30/09/2023 | FC Zürich II | - | FC St. Gallen II | 2:3 | ||||
| 10. Round | 07/10/2023 | FC St. Gallen II | - | BSC Young Boys II | 0:1 | ||||
| 11. Round | 14/10/2023 | FC Rapperswil-Jona | - | FC St. Gallen II | 4:1 | ||||
| 12. Round | 18/10/2023 | SC Kriens | - | FC St. Gallen II | 3:2 | ||||
| 13. Round | 21/10/2023 | FC St. Gallen II | - | FC Paradiso | 1:2 | |
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| 19. Round | 18/02/2024 | Servette FC U21 | - | FC St. Gallen II | 1:5 | ||||
| 20. Round | 25/02/2024 | FC St. Gallen II | - | SC Brühl | 1:2 | ||||
| 21. Round | 02/03/2024 | FC Lugano II | - | FC St. Gallen II | 1:3 | ||||
| 34. Round | 25/05/2024 | Etoile Carouge FC | - | FC St. Gallen II | 5:1 |
Germany