Manchester United are set to play Russian side Rostov in the first leg of the Europa League last-16 tie on Thursday night.

However, United manager Jose Mourinho has said that he is still not sure about which team he will play in Russia.

The Portuguese manager has expressed his concerns regarding the state of the playing surface at the Olimp-2 stadium.

When asked about Henrikh Mkhitaryan's possible involvement in the game, he said: "I don't know which team to play, really.

"I don't know which team I will play, I don't know if Mkhitaryan is going to play. I have a lot to think because I was expecting something more playable.

"I didn't have any contact with anyone until now; I just had a quick contact with one gentleman from UEFA when I was looking at the pitch.

"And when I told him about my concerns, the gentleman told me the plays are insured - if something happens, no problem."