Herrera believes there will be plenty more to come from the 25-year-old over the coming weeks, telling reporters after a 2-2 draw at St Mary's: "When the ball was fed to him [Lukaku], he held it for the team".
United were forced into a makeshift 3-5-2 line-up, with Scott McTominay and Nemanja Matic in defence, with Paul Pogba and Herrera in central midfield alongside Marouane Fellaini. Make it simple, make the ball arrive fast to the attacking players.
Asked what his aspirations were for the remainder of the season after Saturday's 2-2 draw at Southampton, Mourinho told Brazilian broadcaster, RedeTV: "Try to win as many points as possible and try [to achieve] nearly the miracle of finishing fourth".
"We did so well in the last 15, 20 minutes of the first half, we chose to connect to the attacking players by transporting the ball, the right choice of pass, accelerating the game, but in the second half we went back to that dynamic". The players they don't understand that simplicity is genius, especially in some parts of the pitch.
"His agent is not the kind of agent that is manipulative like others, his agent lets him think and decide by himself so the point is to agree the contract that the club wants to give and that the player wants to accept... and this is just my feeling, they are going to finish well".
"There were examples of players fighting to the limits - Marcus Rashford, Phil Jones and many others - showing that respect for the shirt and for the club".More news: Arsenal and Tottenham charged over player conduct in north London derby
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"It worked quite well, the goals we conceded were a direct free-kick and a good shot". It doesn't matter the system we play, it has to do with the characteristics of the players. But we needed to lose less balls in midfield and if you do that you have more continuity in attack.
"We don't have many mad dogs, the ones who bite all the ball all the team and press all the time, we don't have many with that spirit", he said.
"To have more continuity in our attacking waves you can not lose the ball so many times".
"I know him very well and I know the positions he can play; the jobs he can do".
"I'm pleased with him even without that [goal] because his work rate was incredible", he said. He tried to do everything. You don't respect players and supporters.