Union Saint-Gilloise (Jupiler Pro League): every transfer in and out, fees paid and earned, squad market value, €80m spent and €164m earned. Tracked squad: ACTUAL Value €108m, in line with the market. Valued as of 2026-08-25.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-08-21 | Fedde Leysen | Union Saint-Gilloise | US Sassuolo | Loan |
| 2026-08-18 | Promise David | Union Saint-Gilloise | Brighton & Hove Albion | Loan |
| 2026-08-01 | Hervé Koffi | RC Lens | Union Saint-Gilloise | Loan |
| 2026-08-01 | Mamadou Thierno Barry | Union Saint-Gilloise | Al-Shabab Club | Loan |
| 2026-07-28 | Kjell Scherpen | Union Saint-Gilloise | Ipswich Town | €10m |
| 2026-07-02 | Relebohile Mofokeng | Orlando Pirates | Union Saint-Gilloise | €3.5m |
| 2026-07-01 | Nikki Havenaar | SV Ried | Union SG | €400k |
| 2026-07-01 | Ondrej Kricfalusi | Banik Ostrava | Union SG | €5m |
| 2026-07-01 | Nikki Havenaar | SV Ried | Union Saint-Gilloise | €400k |
| 2026-07-01 | Nohim Chibani | Quevilly Rouen | Union Saint-Gilloise | Free |
| 2026-07-01 | Ilan Hurtevent | KV Kortrijk | Union Saint-Gilloise | Free |
| 2026-07-01 | Darius Olaru | FCSB | Union Saint-Gilloise | €3m |
| 2026-07-01 | Christian Burgess | Union Saint-Gilloise | KAA Gent | Free |
| 2026-01-28 | Cristian Makaté | Union SG | La Louvière | Loan |
| 2026-01-24 | Mathias Rasmussen | Union SG | St. Pauli | €1m |
| 2026-01-14 | Sofiane Boufal | Union SG | Le Havre AC | Free |
| 2026-01-13 | Besfort Zeneli | Elfsborg | Union SG | €3.4m |
| 2026-01-13 | Massiré Sylla | Lyn | Union SG | €800k |
| 2026-01-03 | Mateo Biondic | Eintracht Trier | Union SG | €220k |
| 2025-09-08 | M. Diang | Ranheim | Union Saint-Gilloise | Loan |