Read what Manchester United Did to Antonio Valencia

Antonio Valencia was constrained off with hamstring damage as Manchester United barely beat West Brom.

The 32-year-old was constrained off in the 66th moment in the wake of going down on the far touchline and was supplanted by Marcos Rojo, as Ashley Young changed from left to appropriate back.

Joined protected shakily without Valencia, with Rojo at fault for Gareth Barry's 77th-minute complete before he offered the hosts support via recklessly yielding a corner.

Valencia has begun each of the 18 of United's Premier League coordinates this season however that run could arrive at an end at Leicester on Saturday.

"This is the thing that I call December damage," Mourinho said. "It is damage of collection of weakness. It is a solid one. Hamstring. Huge, little, medium, I don't have the foggiest idea. We should hold up. I think he is an accomplished person to not release it as far as possible.

"Be that as it may, it is damage of weakness. Everybody in the Premier League particularly the ones in more aggregation of containers, European glasses, they are in danger."

Joined were 2-0 up at half-time through objectives from Romelu Lukaku and Jesse Lingard yet went under extreme weight as West Brom undermined an equalizer. Mourinho was asked whether the players capitulated to nerves.

"Confused inquiry, convoluted answer," Mourinho included. "Be that as it may, the main thing I can state is they are people and in the event that you attempt as they did in light of my experience, my identity, when my group is winning it keeps an enthusiastic adjust.

"What's more, we don't do a carnival and when we are losing and not in a cheerful minute we do whatever it takes not to be discouraged and keep our adjust, so I think it is vital yet with individuals joy have an impact in exhibitions."