Manchester United boss Jose Mourinho says there'll be no underestimating Champions League opponents Young Boys.

Young Boys will host United on an artificial pitch.

Mourinho said, "They come from pot four and there the world will say: They have no chance to qualify. But for some reason they have now. They went to Croatia and won against Dinamo Zagreb.

"For some reason, they beat Basel and took the title. And, moreover, they play on artificial turf. That's a huge advantage for them and a huge disadvantage for the other teams."