Neymar was taken off on a stretcher after going over on his ankle during Paris Saint-Germain’s 3-0 win over Marseille on Sunday night.
The Brazil star went down in agony and held his hands over his face as he was carried off of the pitch in the 80th minute.
PSG host Real Madrid in the return leg of their last-16 Champions League tie on March 6. They lost the opening encounter 3-1.
Neymar could now be a doubt for PSG’s Champions League second leg against Real Madrid.
Shortly after the final whistle, PSG captain Thiago Silva told Canal+: ‘We lost a very important player before the end in Neymar and his ankle had already started to swell. I’m not a doctor but I don’t think he’ll be ready for Wednesday (in the French Cup quarter-final against Marseille).’
Manager Unai Emery was hopeful on Neymar’s condition.
He told the club’s official website after the 3-0 win: ‘The injury to Neymar was the only negative. We hope it is nothing serious, but we will wait for the scans.’
It had otherwise been an excellent night for Emery’s side. Kylian Mbappe, with his 10th league goal of the season, and a Rolando own goal put the Parisians in control before the break, and a superb Edinson Cavani strike rammed home the Ligue 1 leaders’ superiority.
PSG’s 23rd league win, from 27 games, extended their advantage at the top to 14 points after second-placed Monaco had drawn 3-3 at Toulouse on Saturday.