Overview
- Julián Álvarez opened the scoring in the 40th minute, finishing a move created by Giuliano Simeone down the right.
- Conor Gallagher doubled the lead in the 72nd minute, smashing in a loose ball after an Alexander Sorloth-led counter.
- Union Saint-Gilloise replied in the 81st minute when Ross Sykes headed in from a Sofiane Boufal free kick to the far post.
- Marcos Llorente sealed the win in stoppage time by converting a rebound from inside the box.
- Atlético sit 14th on six points after four games, level with five teams, while Union are 26th on three points and outside the qualification places.