Anderlecht player-manager Vincent Kompany could be out of his Manchester City testimonial.
Kompany was forced off during Anderlecht's 1-0 defeat to Genk.
The defender, who joined the Belgian club in May following his departure from City, was substituted in the 75th minute of Anderlecht's fifth league game of the season.
Kompany suffered what looked like a hamstring injury during the second half at the Luminus Arena.
It has not been confirmed how long the centre-back will be sidelined for, ahead of his testimonial at the Etihad Stadium on September 11.