Chelsea boss Frank Lampard admits N'Golo Kante's abductor injury 'doesn't look great'.
The World Cup winner was substituted after just 10 minutes of Monday's 2-0 loss to Manchester United.
And Lampard was not optimistic about the injury when speaking after the match.
He said: "It's an abductor injury. We'll have to assess it, scan it, but it doesn't look great."
It comes a huge blow for the Blues, who will need the Frenchman firing as they look to secure a top-four finish, as well as playing Bayern Munich in the Champions League last-16 next week.