| 5. Round | 28/09/2023 | RWD Molenbeek | - | Union Saint-Gilloise | 2:3 | ||||
| 9. Round | 01/10/2023 | Union Saint-Gilloise | - | Sporting Charleroi | 3:1 |  |
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| 11. Round | 20/10/2023 | Union Saint-Gilloise | - | KAS Eupen | 4:1 | ||||
| 12. Round | 29/10/2023 | KVC Westerlo | - | Union Saint-Gilloise | 1:3 | ||||
| 14. Round | 12/11/2023 | Union Saint-Gilloise | - | KV Kortrijk | 3:0 | ||||
| 17. Round | 10/12/2023 | Sporting Charleroi | - | Union Saint-Gilloise | 1:3 | ||||
| 21. Round | 21/01/2024 | Union Saint-Gilloise | - | Sint-Truidense VV | 2:1 | |
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| 22. Round | 28/01/2024 | RSC Anderlecht | - | Union Saint-Gilloise | 2:2 | ||||
| 23. Round | 31/01/2024 | Union Saint-Gilloise | - | RWD Molenbeek | 3:2 | ||||
| 24. Round | 03/02/2024 | KRC Genk | - | Union Saint-Gilloise | 0:1 | ||||
| 25. Round | 10/02/2024 | Union Saint-Gilloise | - | KVC Westerlo | 2:2 | ||||
| 26. Round | 18/02/2024 | KV Kortrijk | - | Union Saint-Gilloise | 1:3 | ||||
| 27. Round | 25/02/2024 | Union Saint-Gilloise | - | Standard Liège | 2:1 | ||||
| 28. Round | 02/03/2024 | Oud-Heverlee Leuven | - | Union Saint-Gilloise | 0:2 | |
 |
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| 29. Round | 10/03/2024 | Union Saint-Gilloise | - | KAA Gent | 1:1 | ||||
| 30. Round | 17/03/2024 | Royal Antwerp FC | - | Union Saint-Gilloise | 1:1 |
England