On Friday, PSG announced the squad for the match against Clermont without their star forward, who also missed the 4-0 routing over Nantes last weekend for the traditional curtain-raiser between the French league champion and the French Cup winner.
"Due to pain in his adductor muscles, Kylian Mbappe will continue to receive treatment at the training centre. A further update will be provided in 72 hours," PSG said in a statement.
New PSG coach Christophe Galtier said on Thursday that he expects more reinforcements before the end of the summer transfer window on Sept. 1.
"I want a certain number of players in my squad, players who are very similar in level, to perform well throughout the season and to create healthy competition," he said at a news conference on Thursday. "I know the club is doing all it can to have a very competitive squad."
Information from The Associated Press was used in this report.