The Ligue 1 champions beat Saint-Etienne 2-0 at the Parc des Princes on Sunday but their coach was left "angry" by their performance after the break
Two first half goals from Zlatan Ibrahimovic saw off Christophe Galtier's side but the former France boss was left disappointed with their performance after the break.
"The team did not have a good match," he told Canal+ after the game.
"It was a good first half, but we were average in the second. They pushed us into playing in small spaces. We had to avoid this and be quicker in the second half.
"That annoyed me a bit, but you have to accept that you don't always play well."
PSG's 2-0 win saw them restore their eight-point lead at the top of the Ligue 1 table after Monaco had cut the gap to five with victory over Olympique Lyonnais.