Marseille have concerns over key players ahead of their Champions League clash with Arsenal on Tuesday.
Forward Andre-Pierre Gignac scored a superb goal in OM's 3-1 win at Ajaccio in Ligue 1 on Friday before coming off late on with a rib knock.
Marseille said that he would return to training "in 48 hours", giving him a chance of making the game in London.
There is greater concern for French international playmaker Mathieu Valbuena, who also came off in Ajaccio with a hip injury and was due to be assessed on Sunday.
Meanwhile, Tunisian forward Saber Khalifa was doubtful with an adductor problem.
Marseille are already eliminated from the Champions League, having lost all four games in Group F.