After eight minutes, PSG were awarded a penalty after Sergio Ramos was brought down in the penalty area.
Kylian Mbappé stepped forward and missed, but the penalty was overturned as players in Montpellier had entered the penalty area too early.
Then the striker also missed the second attempt and after 20 minutes of play the striker left injured.
This barely two weeks before PSG's first round of 16 final against Bayern Munich in the Champions League.
Sergio Ramos also went out injured for PSG, who nevertheless won 3–1 after Fabian Ruiz and Lionel Messi scored the first two goals.
However, it was a nervous finish to the match as Montpellier pulled one back in the 89th minute through Arnaud Nordin before Warren Zaire-Emery settled the final score in stoppage time.
Before today's victory, PSG had taken four points in the last four games.
PSG lead the league with five points to spare on runners-up Marseille.