Ghana winger Frank Acheampong will be out for a month after picking up an ankle injury earlier in the week.
The 19-year-old sustained the injury while in action for Anderlecht in their friendly game against Aalst on Tuesday.
The Ghana U20 star has been told he requires four weeks to make a full recovery following further examinations on his injury.
Acheampong is now likely to miss games against Mons, Lokeren, Genk and OH Leuven.