Mourinho was the manager to give McTominay his breakthrough at Old Trafford and even awarded the Scot with a special award as his own player of the season at the end of the 2017-18 campaign.
"That's the way we normally do and didn't lose because of an attacking set up," Mourinho told reporters when asked about his side's attacking approach. "Because of the way we come to the game by the emotional way, they had more emotion than us, you see for example McTominay performance, the globality of his performance, he was dominant.
"But then, as I was saying, half-time we finish the first-half with a good feeling of a positive result, the feeling of we were playing better than them, much more control in last 10 or 15 minutes.
"In the second-half we make that mistake and the game is a different game, after that, one injury here, one injury there, they did well, the referee allowed them to do it."