The Red Devils had a massive helping hand from the reckless Chelsea goalkeeper Robert Sanchez and to tell the truth they should have been assured of their victory long before the final whistle sounded.
But even withstanding the clumsy fouls from Casemiro which earned the Brazilian two yellow cards and cancelled out Sanchez's sending off, plus the fact his team were pushed to the limits by the visitors deep into added time, there was something hugely encouraging about the manner of the win for the coach.
His players, especially the defenders, put their bodies on the line to get the win over the line. Amorim's team showed the aggression he has been asking for. And, with the exception of Casemiro, they did not lose their heads. They withstood the pressure and for once they did not cave in. It cannot be denied that nearly everything went in United's favour, from the early red card, Bruno Fernandes' goal being marginally onside and Cole Palmer being forced off injured.
But not many people were backing United to win this game before kick off given the negative mood around the club and when push came to shove they emerged with the three points against a Big Six side, something they had not previously done at Old Trafford on Amorim's watch.
GOAL breaks down the winners & losers from Old Trafford...






