"Everybody knows he has a favourite surface but he has also to win on surfaces he is not in love with - so we have to do it".
Man United lost away to FC Basel - the team normally representing Switzerland at this level - last season but have never played a competitive game against Young Boys.
United will be able to call on the services of left-back Luke Shaw for tonight's match at the Stade de Suisse following the England international's recovery from a head injury. Do I feel if we have to go to play a big massive game am I going to start that game all the time?
"I don't want to use that [the pitch], especially before the match, as a possible excuse for a not very good performance".
A number of United's players were seen raising their eyebrows when stepping out for training on the plastic pitch, with the added impact meaning United captain Antonio Valencia did not travel for the Group H opener.
Jose Mourinho will be keen to make-up for last season's disappointment that saw United crash out to Sevilla at the last-16 stage of the competition following a 2-1 second leg defeat at Old Trafford.
"It's clear they are not used to pitches like this, so in the beginning I guess it will be a special feeling, but with training and the warm up I think they will be all right".
"So, we brought Luke Shaw back to the squad and to the team".
"We decide not to play Antonio Valencia because his knee is not a knee that needs an artificial pitch at all", said Mourinho, speaking in his pre-match press conference.
The 20-year-old's career has been at the centre of a debate amongst pundits and critics.
"I think it's premature to talk about our chances when we haven't even played our first match", he added.
It has been a troubled start to the season, but United come into this game on the back of successive Premier League wins over Burnley and Watford.
"We have Lukaku, Rashford, Mata, Alexis, Martial - they all can not play together, so try to be a little bit happy for the ones that are playing and not be critical of the ones that are not".