Chelsea midfielder N’Golo Kante was forced off injured inside 12 minutes during their game against Manchester United on Monday.
The France midfielder fell to the ground at Stamford Bridge and had to be helped up by medical staff.
It appeared to be an off-the-ball incident with no Manchester United player making a challenge on the Chelsea midfielder.
He was replaced by Mason Mount after a short delay in the match.
Kante had started 13 out of Chelsea’s last 14 games in all competitions after missing around four weeks of action due to a hip injury.