Sedan goalkeeper Patrick Regnault will be sidelined for the next three weeks with a knee injury.
The 32-year-old fell awkwardly during training on Wednesday and was immediately taken for examinations.
Tests showed a knee sprain and damage to the ligaments, however, he will only need three weeks to recover.
Meanwhile, left-back Nadir Belhadj has broken a finger while on international duty with Algeria.
Belhadj will miss this weekend's Ligue 1 clash against Le Mans.
Injuries to two key players will not aid a struggling Sedan side, who sit bottom in France's top division.