Lorient dealt a blow to Marseille's hopes of clinching a UEFA Champions League place with a 2-1 victory in Ligue 1.
L'OM began the weekend two points shy of third-placed Bordeaux but could not recover after going two goals down at Stade de Moustoir.
Rafik Saifi put Lorient in front on the hour mark and Ulrich Le Pen added a second on 74 minutes.
On-loan Liverpool striker Djibril Cisse did give l'OM a chance of rescuing a point when he scored from the penalty spot with ten minutes to go.
However, Albert Emon's side could not find an equaliser as they passed up the chance to increase the pressure on their rivals in the hunt for a European finish.
Click below for match summary:
Lorient 2-1 Marseille