Despite the loss, Ancelotti's side remain top of Ligue 1, three points clear of Lyon, but the PSG coach admitted maintaining their form was tough.
“The French championship is special, there is a lot of rhythm, speed and intensity. It is not always easy,” the 53-year-old Italian told Ma Chaine Sport.
“In Ligue 1, talent is not enough. The defensive work is the most difficult thing for Pastore, Lavezzi and Lucas."Ancelotti’s focus is now on the upcoming Ligue 1 and Coupe de France fixtures against Marseille, who currently lie third in the table.
“Marseille are a beefy team who use many crosses,” he said, adding: “They are aggressive and have benefited from their mental strength.”