Alexander Golovin was forced off with an injury as Monaco drew 1-1 with Le Mans on matchday 10 of the French league.
The Russian midfielder left the field in the 54th minute, appearing to limp as he made his way off. Paris Brunner came on as his replacement.
Monaco were leading 1-0 when Golovin was substituted, having taken the lead through Mamadou Coulibaly in the 40th minute.
However, Le Mans rescued a point in the closing stages. Erwan Colas equalised in the 90th minute to complete the scoring.
No details had been released at the time of publication about the nature of Golovin’s injury or his expected recovery period.
The draw leaves Monaco sixth in the table on 16 points, seven points behind leaders PSG.