The Italian believes their display against Jean Fernandez's men was a replica of their draw with Bordeaux the week before, while goalkeeper Salvatore Sirigu wants to see a reaction
A pair of strikes from Bakaye Traore and Yohan Mollo stunned the French giants, despite Mohamed Sissoko's attempts to restore parity midway through the match, but the 52-year-old has refused to panic in the face of adversity.
"I'm disappointed by the result, not the team's performance, much like our display against Bordeaux last week," Ancelotti was quoted as saying by L'Equipe.
"Frankly, I repeat, we did not deserve to lose this match."
Goalkeeper Salvatore Sirigu also reflected on the loss: "There are two scenarios that await us - either you collapse or you bounce back and react."
PSG find themselves second in Ligue 1, level on points with leaders Montpellier, who have a game in-hand over Ancelotti's team.