Rumelu Lukaku, Alexis Sanchez and Jesse Linguard led United's attack against Wolves.
United, with former manager Sir Alex Ferguson watching on during his first visit to Old Trafford since having emergency brain surgery in May, were looking for a third straight league win.
"If he starts arriving in possible scoring positions that can be a plus for the team, so I'm happy with that".
"What is most important for me is that we are growing".
"I expect my team to play better than we did", added Mourinho.
'They're as accomplished a team as I've seen in their first year out of the Championship, ' said Match of the Day pundit Danny Murphy.
"I could say we were exhausted, Champions League, very bad pitch [against Young Boys], the body suffers the different impact on an artificial rather than actual grass, not coming home after the match". They play like I like to play which is like the World Cup final. 'We've had three games at home and we've got only four points. "We started poorly and it it hard to win matches when you are not there".
"I can't explain the difference of attitude because I never had a difference of attitude". We came back with a good spirit, in peace because we recovered. "Fellaini played 20, 25 minutes, Fred played 60 minutes, Valencia also didn't play".
Young Boys did look the better side at the start of the encounter and tested United's number one shot-stopper David De Gea with a couple of long-range efforts, but to no avail. 'I'm not the manager, I can not say that, but obviously we should show more options, ' he added. So yes, it's a mental situation.
"I'm proud of the way we played - the way we defended, organised, putting bodies in front of the ball, and the way we created, produced our chances".
"One team came as if their lives depended on it and one team was too relaxed", he said at his post-match press conference. Mourinho has certainly given a fair share of opportunities to youngsters at United, but given the kind of performances we've seen so far, that number should be higher. "But today I did not like my team", Mourinho said.