PSG have been severely hampered by injuries, Neymar is recovering from ankle surgery and their defense is in tatters.
On Sunday, PSG called up 17-year-old central defender El Chadel Bissiabou, but he was overwhelmed, throwing the ball away far too often.
Kylian Mbappe failed to repeat his late-scoring heroics as he did in the recent games against Strasbourg and Brest.
“We cannot expect everything from Leo and Kilian,” said Gaultier.
“It’s our eighth defeat in 2023, that’s too many.”
Next up for PSG is a trip to Nice who are undefeated since January 2 before a crucial home clash with second-placed Lens.
Lens will be hoping to deliver another blow to their Qatar-owned rivals, whose season threatens to collapse following a Champions League exit at the hands of Bayern Munich and a French Cup defeat to rivals Marseille.
