Lille reclaimed top spot in Ligue 1 but their lead shrunk to a single point as they were held to a goalless home draw by Stade Brestois on Sunday.
The northerners, who had a goal disallowed by the VAR, have 55 points from 25 games as their six-match winning streak in the league came to an end.
Paris Saint-Germain, the only top four side to claim three points this weekend after they beat Nice 2-1 on Saturday, are second on 54 points with third-placed Lyon on 52 after their 2-1 loss to Montpellier.
The principality team are fourth on 49 points.
After a lacklustre opening half, Lille increased the pressure but the visitors stayed compact at the back.
Lille ended the game with not a single shot on target.