Mourinho and his United players proved a big point yesterday when they deservedly put Chelsea to bed and the Special One has explained just how they did it.
Sunday's home victory is the Red Devils' first against Chelsea at the Old Trafford since a 3-1 win in the first leg of the 2011-2012 season.
The Blues looked home and hosed at the start of April, but two defeats in the past four games have opened the door for a Spurs side who are now on a seven-match winning run and showing no signs of letting up, at least not yet.
Diego Costa of Chelsea looks dejected during the Premier League loss to Manchester United.
"On Sunday, he flipped that model on its head".
Herrera, who denied deliberately handling the ball prior to setting up Rashford's opener, said United's display had been "almost perfect".
They are in great form and they have a lot of enthusiasm because they are feeling the possibility of writing history.
Facing his former club, Mourinho rested top scorer Zlatan Ibrahimovic and charged Ander Herrera and Matteo Darmian with the task of man-marking Chelsea dangermen Eden Hazard and Pedro.
Centre-halves Marcos Rojo and Eric Bailly were huge against Diego Costa, while full-backs Antonio Valencia and Matteo Darmian were as threatening going forward as they were determined defensively.
Back then, Ferguson's team was in its majestic pomp, on course for a Premier League and Champions League double.
"I don't know to say, but different teams, different players, maybe it's hard for some managers to find Ander Herrera to do the job that he did today", Mourinho said, as reported by the Manchester Evening News.
"They are phenomenal in counter-attack". We need to be better going forward.
"I was more anxious about him being subdued during the game because he's been so active on the touchline all season". We have to think there are six finals from now until the end.
"Rashford has made it hard for him to leave him out".
Chelsea was successfully nullified, failing to register a single shot on target in a league game for the first time since 2007, and now lead second-place Tottenham Hotspur by just four points.
It was only United's second win this season over one of the other teams in the top six, following November's 1-0 success against an off-colour Spurs.
"(Mourinho) got his tactics spot on and enjoyed a bit of luck, but I don't see that as a template", Souness said.
Craig Burley reacts to Man United's dominant win over Chelsea and evaluates the clubs' road ahead as the season winds down.