Neymar appeared to roll his ankle in the final stages of PSG’s 3-0 win over Marseille on Sunday.
An innocuous tussle with Marseille man Bouna Sarr left Neymar in agony and the Brazil international was seen clutching his ankle clearly in pain.
He was quickly attended by medical staff before being stretchered off in tears.
The Ligue 1 side will be waiting with bated breath to discover the extent of Neymar’s injury.
And the injury could be a huge blow to PSG ahead of their Champions League second leg clash with Real Madrid in nine days time.
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.
Neymar has been in impressive form for PSG since securing his record-breaking move from Barcelona last summer.
He’s scored 29 goals in 30 games while providing 17 assists.