Lyon lost first place in Ligue 1 on Sunday, losing on their own ground against Metz (1-0) at the end of the 20th day, the series of invincibility of the Lyonnais thus stopping at sixteen meetings.
OL are now third in the standings two points from a leading duo, Paris Saint-Germain (victorious at Angers on Saturday night 0-1) and Lille (who beat Reims 2-1 on Sunday), while Metz, who scored by his Belgian striker Aaron Leya Iseka in the 90th minute, is 9th.
Beaten on Saturday by Nîmes (1-2) at the Vélodrome on Saturday, OM missed the opportunity to come back to the leading teams.
On Wednesday, André Villas-Boas' men will find Lens in a late match.
At the bottom of the table, Lorient and Dijon bring up the rear.
Ligue 1 standings in full here
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League 1 standings