Saint-Etienne heat up Champions League charge
Wahbi Khazri opened the scoring from the spot 10 minutes after the break following a VAR check of Sergi Palencia’s handball before Debuchy headed home the second from a corner to seal the points 17 minutes before the end.
Debuchy then completed the win with a deflected close-range strike in the final minute to put Jean-Louis Gasset’s side back ahead of Marseille, who started the day fourth and in the Europa League spot after surviving late VAR penalty drama on Saturday to scrape to a 2-1 win over Nimes.
Lyon go into the final six games in trouble following coach Bruno Genesio’s announcement that he would leave the club in the summer after falling out of favour with the fans.
Paris Saint-Germain only need a point at second-placed Lille later Sunday to seal their sixth league title in seven years.