David de Gea will undergo tests on Friday after injuring himself ahead of United’s loss to Midtjylland

Manchester united are sweating on the fitness of David de Gea ahead of Monday’s FA Cup tie with Shrewsbury after the goalkeeper suffered a knee injury in the warm up for Thursday’s Europa League defeat to Midtjylland.

The Spanish international will be assessed by United’s medical staff today and undergo scans.

Van Gaal was uncertain of the extent of the injury on Thursday, but De Gea was in sufficient discomfort to have to pull out of the 2-1 defeat to the Danish minnows.

He did manage to watch on from the stands with his legs covered by a blanket.

De Gea pulled up sharply when diving to make a save to raise concern among United’s staff.

When he failed to shake off the problem understudy Sergio Romero had to be called into the starting line up.

He became the 14th player to join United’s injury list, along with Wayne Rooney who suffered knee ligament damage in Saturday’s defeat to Sunderland.

Van Gaal said: “It happened in the warm-up. We have to wait and see the scan tomorrow and maybe we can say more.

“It was a big surprise. It is his knee.

“I think it’s the law of Murphy. When you have a list of 13 injured players and a few minutes before the game we can add another player to the list then it is difficult to cope with such a list of injured players.

“We have to cope with a list of 14 injured players and that’s not easy. I have to make another line-up every week more or less and that isn’t contributing to confidence.”

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