Manchester United boss Erik ten Hag admits Lisandro Martinez is a major concern.

Lisandro was forced off after clutching his knee during their 3-0 defeat of West Ham.

"It doesn't look good," said Ten Hag.

"There is a bad concern. We have to wait for a few days for the diagnosis. He is very sad, very disappointed. We all feel really with him.

"First of all it is a personal disaster when it is really bad but also for the team it is really bad because he definitely brings us a lot."

Lisandro was playing in only his third league game after more than three months out with a foot injury.