Super Eagles forward Paul Onuachu netted a brace for Genk in their 4-2 defeat against Royal Antwerp on Wednesday.
The Nigerian international scored the first goal inside the opening 10 minutes, but three goals from the hosts turned the tie around.
Ritchie De Laet equalised in the 27th minute, before Birger Verstraete and Koji Miyoshi made it 3-1 for the hosts ten minutes later.
Michael Frey put the game beyond Genk with the fourth goal in the second half, but Onuachu managed to halve the deficit for his team with an 80th-minute penalty.
Onuachu has now scored eight goals in all competitions this season for Genk, who are now languishing in 5th position with 14 points from 8 games.