"I told him after the match what I saw today was the best goalkeeper in the world", Mourinho told BT Sport. You need the keeper to be there for you when the team needs.
Danny Welbeck and Alexandre Lacazette, appealed in vain for penalties and, with his tongue firmly in his cheek, Mourinho said: "I know the pitch is incredible and maybe breeds a desire to go to the floor".
'I am not Pochettino, I am Arsene Wenger, ' he said.
But Arsenal are three points closer to the runaway Premier League leaders - and Wenger reckons this crushing defeat will just make his side even more determined to catch up.
De Gea made an incredible pair of stops on Lacazette and Alexis Sanchez in the 56th minute.
Afterwards Wenger was asked if he took some satisfaction from the game and he said: 'Yes of course, the spirit of the players, the attitude and quality of our combinations were top class.More news: Mueller removed top Federal Bureau of Investigation agent over possible anti-Trump texts
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"We started with that desire and intensity, we played high and created mistakes", he said.
"But I have to say that my players deserve all the great words - I don't know so many more in English".
Arsenal had a few more chances after conceding the third, but after Pogba was sent off in the 74th minute for a stamp on Hector Bellerin, United finally started defending with some objective, and limited the Gunners to half chances to see out the result. I don't know so many in English but incredible, phenomenal, fantastic.
'But we have the experience to get better out of a game like that, you know.
"We have produced an excellent performance but have conceded three goals and had at least 10 chances and were not efficient enough in the box, that is the reality". "If you want to analyse well, watch the difference between them and us and then you will see", he said.