United begin their campaign against Swiss champions Young Boys on Wednesday, six months after their exit to Sevilla last season.
"Everybody knows that he has a favourite surface, but he has also to win on the surfaces that he is not in love with, so we have to do it".
United players kicked and jumped on the pitch before training on the eve of the game, with coach Michael Carrick instructing them to "get a feel for the pitch" with balls once the warm-up was completed.
With a home game against Valencia next, United need a positive start in Group H, but Young Boys are unbeaten this season and will come into the match full of confidence.
"I think Rashford has played more than enough in the last two seasons, the stats were something Mourinho made a point of referencing and I would agree with him", said the former Bayern Munich midfielder.
"I don't want to use the pitch, especially before the match, as a possible excuse for a not very good performance", he added.
"We decided not to bring Valencia because his knee is not a knee that needs an artificial pitch at all", Mourinho told reporters in the Swiss capital on Tuesday.
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"These players have the quality to play on this surface, they have speed and great technique, so it won't be a problem for the great players they have". Speaking ahead of the Champions League opener against Young Boys in Switzerland on Wednesday night, the 27-year-old stopped short of saying he will definitely commit his future to the club but insisted he is happy where he is.
"I would focus on the first match, and after that on the group phase, one of the most hard group phases, and we have two positions to qualify and our focus must be on that".
"So, we brought Luke Shaw back to the squad and to the team".
Shaw will return to the United team after missing Saturday's Premier League win against Watford due to a head injury sustained on England duty.
"I think it's premature to talk about our chances when we haven't even played our first match", he added.
"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".