Marseille's slide down the table continued with a 1-0 home defeat to second-placed Lens at the Stade Velodrome on Sunday.
Lens closed the gap on leaders Lyon to 13 points with the victory, secured through an Aruna Dindane penalty just before the hour mark.
The result meant Marseille have now gone six games without a win and have slumped to eighth in the table and four points off a Champions League qualifying place.
World Cup winner Fabian Barthez rolled back the years as Nantes boosted their survival hopes with a 2-1 victory away to Sochaux.
Barthez produced a string of important stops to deny the hosts who could have taken third place in the league had they won.
Dimiti Payet opened the scoring for the Canaries on 23 minutes but Sochaux equalized from the spot through Alvaro Santos after Alioum Saidou had brought down Valter Birsa.
Claudiu Keseru snatched the points for the visitors six minutes after the break, breaking clear of the attentions of Rabiu Afolabi before slotting the ball past Teddy Richert in the hosts' goal.