Jordan Ayew scored a consolation for Olympique Marseille whose poor run in the French Ligue 1 continued with a 2-1 defeat at Bordeaux on Saturday.
A corner from the left came off Gignac and fell for for the 20-year-old who slotted low past Cédric Carrasso in the 56th minute.
Marseille have been chaotic for much of the last three months, and that was once again the case when they fell behind in the first minute.
OM gave the ball away within seconds of kicking off, and Ludovic Obraniak released Yoan Gouffran on the right.
Stéphane Mbia should have cleared at the near post, but only succeeded in playing the ball off Jussiê for the opener.
The Brazilian added another goal in the 29th minute.
Marseille have won a league game since January and they are in real danger of slipping into the bottom half of the table.
His elder brother Andre Ayew was replaced by Brandao in the 67th minute.
