Ismaïl Saibari suffered a suspected muscular injury during the World Cup Round of 16 match between Morocco and Canada.
The forward was substituted in the 22nd minute after experiencing non-contact pain in his thigh.
FC Bayern Munich, who recently signed the player for approximately 55 million euros, is awaiting a formal medical update.
Saibari has been a breakout star of the tournament, contributing three goals in five matches for Morocco.