Bertrand Traore struck twice but Lyon fell further behind their rivals after surrendering a two-goal lead in Sunday's 2-2 draw at Lille.
Lyon were incensed after being denied a second-half penalty as they slipped to a third straight loss in Ligue 1, with Rennes claiming a 2-0 win on Sunday.
PSG moved 11 points clear at the top of Ligue 1 after beating Lille 3-0 on Saturday, as Montpellier moved up to sixth.
Crystal Palace have made an offer worth up to £16m for Ibrahim Amadou but Lille are now refusing to sell the defender, Sky Sports News understands.
A third Premier League club has joined West Ham and Crystal Palace in trying to sign Lille's midfielder Ibrahim Amadou, according to Sky sources.
West Ham have made an enquiry to Lille for their captain Ibrahim Amadou, Sky Sports News understands.
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