Marseille coach Elie Baup has confirmed that Andre-Pierre Gignac has fractured "the fifth metatarsal in his left foot" during the side's 1-0 defeat against Troyes.
Gignac, 26, departed the game in the 20th minute following a duel with Florian Jarjat, and says he knew straight away the injury was a bad one.
"I felt that it was not going well," the striker explained. "I immediately felt the pain. I knew it was broken."