Herrera grabbed all the headlines on Sunday in Manchester United's 2-0 win over Chelsea as he scored one and assisted the other at Old Trafford.
At one stage four weeks ago after a 2-1 win over Stoke, Chelsea held a 13-point lead.
Meanwhile, Jose Mourinho, Manchester United's manager was understandably chuffed yesterday, proclaiming that he had found a system to halt Chelsea's seemingly unstoppable march to the title.
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.
In these 22 games, Manchester United have had some close calls, including two stoppage-time equalizers.
"So to think that one player missing would have that level of disturbance".
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He said post-match: "If they'd have lost Hazard and Costa and come here to lose I'd say fair enough". A constant menace for Chelsea's defense with his mobility and direct approach, Rashford ensured Ibrahimovic wasn't missed at Old Trafford.
"We have to think that there are six finals from now until the end", Conte said after the match. We have to dust ourselves off and prepare for a huge semi-final, and then we go again with some important home games coming up. I prefer to play for the title instead of not fighting for the title and being calm. "Otherwise we deserve another thing".
Chelsea also have an easier run-in and Conte said he was sure his players can handle the pressure. I think he's very important for us with his quality.
So, the Blues could drop points at The Hawthorns too, but I think they will absolutely wipe the floor with the teams they play in their four home games.
Sunday's comfortable win over Antonio Conte's league leaders has boosted hopes of qualifying for the Champions League by finishing in the top four, and Darmian admits the result provides a lift.
"The first reason is because with Liverpool and Manchester City victories, if we don't win today goodbye Premier League".