StadiumJoseph Marien Stadium
| Current capacity of the stadium |
| Standing | 27 900 |
| Seats | 17 400 |
| Tribune | 10 500 |
| Seats for sponsors | 300 |
| Fans attended |
| 12. 1. 2026 | Union Saint Gilloise-Tervuren | 12 483 |
| 11. 1. 2026 | Union Saint Gilloise-Beňadiková | 4 306 |
| 11. 1. 2026 | Union Saint Gilloise-SK Horní Libochová Kittie | 4 256 |
| 11. 1. 2026 | Union Saint Gilloise-Chomle | 4 215 |
| 9. 1. 2026 | Union Saint Gilloise-Beňadiková | 4 261 |
| 9. 1. 2026 | Union Saint Gilloise-FC Ledbury | 4 178 |
| 9. 1. 2026 | Union Saint Gilloise-Lázně Bělohrad | 4 232 |
| 7. 1. 2026 | Union Saint Gilloise-PsychoS.T.A.R.S. | 4 231 |
| 7. 1. 2026 | Union Saint Gilloise-Týnec nad Sázavou | 4 276 |