Marseille's French international winger Mathieu Valbuena faces up to a month out of action after suffering a collarbone injury during his side's 1-0 Ligue 1 defeat at Lille on Tuesday.
The news comes as a further blow to Elie Baup's outfit after they conceded a late goal by Lille's Nolan Roux which left them ten points behind leaders Paris Saint-Germain who travel to Evian on Wednesday.
Lille meanwhile solidified second place and are just one point behind the capital outfit following Roux's injury time winner.
"Mathieu is suffering from a disjointed collarbone and won't be available for several weeks, maybe three or four," Baup announced at the post match press conference in northern France.
The lively forward is now ruled out for the rest of the year after coming off in the 70th minute following a bad fall resulting from a collision with Lille's Danish defender Simon Kjaer.
To add insult to injury for Marseille, Valbuena's fellow winger Dimitri Payet came off seven minutes later with a calf injury as Baup's attacking options took a severe blow on a chilly night at the Pierre-Mauroy stadium.
Marseille are already missing Ghana striker Andre Ayew who is a long-term injury casualty following knee surgery last week which is expected to sideline him for up to two months.