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Mario Balotelli again failed to score away from home as Nice lost more ground in the race for the Ligue 1 title.
Monaco boss Leonardo Jardim says their title challenge will be stretched by their Champions League run.
Former Manchester United winger Memphis Depay says he will get back to the top of the game after he was not good enough to win over Jose Mourinho.
An own goal from Bastia's Gilles Cioni was the difference as Metz moved farther away from the Ligue 1 relegation zone.
Marseille's hopes of playing European football next season suffered a blow as they were held to a 0-0 draw at Lille.