Manchester United fear Eric Bailly has suffered a serious knee ligament injury.

Bailly, who has impressed since his summer move from Villarreal, limped off after 52 minutes with what Jose Mourinho believes could be a long-term knee injury.

"He is injured and I am afraid he is badly injured," Mourinho said. "In his knee, in the ligament area. He feels that it is really bad."

Bailly has played in all but one of United's matches this season, winning the club's Player of the Month award for August.