Kylian Mbappe scored twice before going off with a thigh injury as Paris St-Germain beat Metz to move two points clear at the top of Ligue 1.
The 22-year-old slotted in a fourth-minute opener and added a second with a deflected strike after Fabien Centonze had equalised with a header.
Mbappe went off injured late on before Mauro Icardi scored a penalty.
PSG boss Mauricio Pochettino is hopeful Mbappe will be fit to face Manchester City in the Champions League this week.
The two sides meet in their semi-final first leg in Paris on Wednesday (20:00 BST).
"We hope it's not too serious," Pochettino said.
"Kylian was calm when he was replaced but even a simple knock is always painful."