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The Gunners ended a 14-year run without a win at Old Trafford thanks to Pierre-Emerick Aubameyang's second half penalty and Egypt midfielder Elneny played a vital role.
And Arsenal's official Twitter account have posted a quite brilliant clip that sums up his performance in the victory.
In the 91st minute when United were throwing the kitchen sink in search of an equaliser, the former Basel man was pressing relentlessly.
Demonstrating some incredible work-rate so late in the game, he ran about 60 yards from one side of the pitch to the other and went after both Luke Shaw and Victor Lindelof - forcing the latter to take a heavy touch that led to an Arsenal throw-in.
Mo Elneny running 60 yards to pressurise Lindelöf on the half way line in injury time all to win us a throw-in was a personal favourite moment from today.- Patrick Timmons (@PatrickTimmons1) November 1, 2020
Refraining from giving away a cheap foul, Elneny was able to buy some extra seconds for his side - who were then able to see out the final moments and bounce back from their home defeat against Leicester City last week in a huge way.
New signing Thomas Partey was immense in the middle of the park but so too was his midfield partner Elneny - which manager Mikel Arteta was quick to point out in his post-match interview.
Reporter: "It looks like you've spent well, doesn't it? Gabriel, Thomas Partey as well."- LTArsenal:tm: (@ltarsenal) November 1, 2020
Arteta: "Yes, Mo Elneny was fantastic."
What a guy :sob:
Elneny, having returned from a loan spell at Besiktas, has been a regular at Arsenal and Arteta loves everything about the way his former teammate conducts himself on and off the pitch.
"What Mo transmits to the team is special," Arteta said in his post-match press conference.
"He has this energy as a person. He goes in the room and he creates that atmosphere. Today I said that we needed that energy and that positive feeling that he brings all the time. I think he was tremendous.
"Obviously I played with him so I know his qualities and who he is as a person, and what he brings to the squad. I like players that have zero ego, who play for the team, who want to contribute regardless of what it is, whether that's one minute or 96 minutes or just by being there and giving positive feedback all the time.
"He contributes to our culture and is a person who admired by everyone at the football club. And now I think his qualities he's showing as a footballer, I always believed he had them."