Jose Mourinho admits he is worried about Manchester United ahead of Thursday night's meeting with Zorya Luhansk.

The Red Devils need to avoid defeat to the Ukrainian side to progress to the Round of 32 in the Europa League but the playing conditions in expected freezing temperatures have provided some cause for concern for Mourinho.

"The pitch is hard, the pitch is icy," he said.

"I think UEFA know the conditions of the pitch and everyone knows the conditions in Ukraine and Eastern Europe in mid-December are more difficult.

"So if UEFA was worried about it, they should change the fixtures and not allow it to be played here in mid-December.

"I think that is a problem. They are trying, they are putting some warmth on top of it, but people cannot make miracles, so let's hope everything goes well."