
Gomis scored twice in the 3-2 loss in Ligue 1 but sprained his right knee and suffered ligament damage in a collision with Nantes defender Diego Carlos, RMC Sport reported on Monday.
The 31-year-old, capped 12 times by France, will miss Marseille's home game against arch rivals and reigning French champions Paris Saint-Germain on February 26 with his absence a damaging blow to the club's European hopes.
Dimitri Payet leaves West Ham for Marseille
Gomis is on loan from Premier League side Swansea City and equalled his best goals haul for a single season at the weekend, matching his return from 2007-08 with Saint-Etienne and then with Lyon in 2012-13.
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