The boss singled out contributions from Diogo Dalot, who made his debut for the club, and Luke Shaw as his side eased past the Swiss champions with a brace from Paul Pogba and a second-half goal from Anthony Martial.
Speaking to BT Sport and in his post-match press conference, Mourinho highlighted Dalot's potential at United and also identified Pogba's confidence to take another penalty, following the Frenchman's miss from the spot against Burnley earlier this month.
GOOD PERFORMANCE AFTER DIFFICULT START
“I'm happy. I can understand the reasons why we didn’t start well, why we took 25 minutes to be in control, I can see why Young Boys forced it a little in the beginning.