Tuesday 4 August
| Time | Match | Score | Competition | Stadium |
|---|---|---|---|---|
| 19h00 |   Union St. Gilloise vs Bodo/Glimt | 3 - 3 | UEFA Champions League Stage : Round 3rd Qualifying | AlbertPark |
Tuesday 11 August
| Time | Match | Score | Competition | Stadium |
|---|---|---|---|---|
| 17h00 | Bodo/Glimt vs Union St. Gilloise | 3 - 2 | UEFA Champions League Stage : Round 3rd Qualifying | Aspmyra Stadion |
Thursday 17 September
| Time | Match | Score | Competition | Stadium |
|---|---|---|---|---|
| 20h00 |  Plzen vs Union St. Gilloise | - | UEFA Europa League Stage : League phase J1 | Doosan Arena |
Thursday 15 October
| Time | Match | Score | Competition | Stadium |
|---|---|---|---|---|
| 17h45 |  Union St. Gilloise vs Real Sociedad | - | UEFA Europa League Stage : League phase J2 | Den Dreef |
Thursday 22 October
| Time | Match | Score | Competition | Stadium |
|---|---|---|---|---|
| 17h45 |  Union St. Gilloise vs Hapoel Beer Sheva | - | UEFA Europa League Stage : League phase J3 | Den Dreef |
Thursday 5 November
| Time | Match | Score | Competition | Stadium |
|---|---|---|---|---|
| 21h00 |  Celta Vigo vs Union St. Gilloise | - | UEFA Europa League Stage : League phase J4 | - |
Thursday 26 November
| Time | Match | Score | Competition | Stadium |
|---|---|---|---|---|
| 18h45 |  Union St. Gilloise vs Lech Poznan | - | UEFA Europa League Stage : League phase J5 | Den Dreef |
Thursday 10 December
| Time | Match | Score | Competition | Stadium |
|---|---|---|---|---|
| 21h00 |  Lyon vs Union St. Gilloise | - | UEFA Europa League Stage : League phase J6 | Parc Olympique Lyonnais |
Thursday 21 January
| Time | Match | Score | Competition | Stadium |
|---|---|---|---|---|
| 18h45 |  Beşiktaş vs Union St. Gilloise | - | UEFA Europa League Stage : League phase J7 | Besiktas Park |
Thursday 28 January
| Time | Match | Score | Competition | Stadium |
|---|---|---|---|---|
| 21h00 |  Union St. Gilloise vs Celtic | - | UEFA Europa League Stage : League phase J8 | Den Dreef |