Manchester United goalkeeper David De Gea insists Wednesday night's clash with Young Boys will not be a walk in the park.

The Red Devils will the Swiss club on their artificial pitch at the Stade de Suisse.

De Gea said: "Well, we are not used to playing on artificial grass, so it's going to be a bit different, probably more difficult for us.

"But we have to train today (Tuesday) to see how the balls work on this pitch and try to play our football here.

"We know it's going to be a tough game."