StadiumJoseph Marien Stadium
| Current capacity of the stadium |
| Standing | 27 900 |
| Seats | 17 400 |
| Tribune | 10 500 |
| Seats for sponsors | 300 |
| Fans attended |
| 27. 11. 2025 | Union Saint Gilloise-Merelbeke | 17 968 |
| 26. 11. 2025 | Union Saint Gilloise-Knyk | 4 874 |
| 26. 11. 2025 | Union Saint Gilloise-nová MFK Rožňava | 5 143 |
| 26. 11. 2025 | Union Saint Gilloise-FC Ledbury | 4 868 |
| 26. 11. 2025 | Union Saint Gilloise-Legia Warszawa | 4 979 |
| 25. 11. 2025 | Union Saint Gilloise-Płoty | 4 955 |
| 25. 11. 2025 | Union Saint Gilloise-Guerande | 5 025 |
| 25. 11. 2025 | Union Saint Gilloise-FC Inter Nice | 5 044 |
| 25. 11. 2025 | Union Saint Gilloise-Legia Warszawa | 5 070 |