Eden Hazard may have suffered a "serious injury" when he came off after 31 minutes in Monday's match.

Hazard limped off the pitch.

"I don't know what is wrong," said Jose Mourinho.

"The only thing I know is in 10 seconds he made the decision himself. It must be a serious injury because he just left the pitch and just made the decision not to go in.

"His first reaction was 'I can't' and I was going to make the change. His second reaction was 'I want to try,' and when he goes on the pitch, first step he immediately says 'I can't do it.' It was him in a few seconds who had three different perspectives, but clearly he couldn't do it."