Two goals from Jesse Lingard and one from Antonio Valencia earned United the victory - Mourinho's first away against a top-six club since he arrived at Old Trafford.
The team defended well for 90 minutes.
It was De Gea, however, who Mourinho singled out for special praise, telling BT Sport, "I told him after the match, what I saw today was the best from a goalkeeper in the world".
"You need the keeper to be there for you when the team needs". "All the effort from the players was magnificent".
Gold trader says he never liked Turkish banker facing trial (HALKB)
The testimony came as Zarrab was cross-examined by one of Atilla's lawyers, Cathy Fleming. Erdogan on Sunday dismissed the case as a politically motivated attack on Turkey.
"Well, I don't know how to answer that question, but what I do know is where he went is risky". "I leave to you (to decide)", he said, when asked for his thoughts. "I believe at the back, we didn't start well at all and we put ourselves in a very hard position".
"Of course, they can say they had chances, but we fought and had a great goalkeeper, too".
United have until 1pm on Monday to appeal the decision, which means Pogba will be suspended for three domestic games - including Sunday's eagerly anticipated Manchester derby.
For Arsenal manager Arsene Wenger, who has had an often fractious relationship with Mourinho, there was pride in the way his side recovered from a horror start but ultimately a sense of frustration at their failure to take anything out of the game.
"I think the quality of our performance was good but we were not decisive enough", said Wenger after the game.
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