Before Chelsea came to town there had been the odd excellent offensive showing coupled with occasional energetic defensive displays, but this was Herrera in all-rounder mode and he could hardly have been more influential.
It was a Mourinho masterclass of the highest order, and while many had considered his selection to be an admission that their top-four assault was all-but over the reality was that the Portuguese was actually handing the remainder of the Premier League a timely blueprint on how to stifle the previously-imperious Chelsea attack.
Chelsea goalkeeper Thibaut Courtois has not travelled with the squad to take on Manchester United at Old Trafford after picking up an ankle injury in training, according to reports. Liverpool sits in 3rd, 6 points ahead of United, but the Jose Mourinho's men have 2 games in hand.
Alternatively subscribers can follow the game with Sky Go or keep up to date with all the action on our live blog. Then he drilled home a shot himself with the aid of a deflection off Kurt Zouma as a complacent Chelsea back line failed to respond when Ashley Young's cross wasn't fully cleared.
The rest of the half Eden Hazard and Diego Costa were stalled by Manchester United's tight marking.
Expect a score-draw with a 2-2 on the cards. "But they have a great team, or else they would not be number one".
A win for the away side would see Antonio Conte become the fourth Chelsea boss to record a Premier League double over the Red Devils, after Glenn Hoddle in 1993/94, Jose Mourinho in 2004/05 and the aforementioned Carlo Ancelotti in 2009/10.
His tactics were spot on, as they often are in big games. At fifth place in the EPL, the Red Devils are just on the outside of the cut-off mark.
"They haven't been playing in Europe this season and they went out from the League Cup early".
Manchester United's Premier League unbeaten run now stands at 21 matches (W11 D10 L0) - the joint 10th longest unbeaten run in the history of the competition.
Chelsea have won as many points this season as it took to win the league exactly 20 years ago (Manchester United with 75 points in 1996/97).
Perhaps Jose is still a bit bitter over his exit from Chelsea.