The Englishman burst onto the scene last season under Louis van Gaal by scoring consecutive braces against Dutch side Midtylland in the Europa League and Premier League rivals Arsenal.
His performances at Old Trafford earned him an England call-up in May, where he became the youngest Englishman to score during a international debut against Austria.
Speaking about his talent, Hereera sees him as the best player of his age in the world right now.
“We have to be patient with Marcus. He is maybe the best talent under 20 years old in the world so he is giving us a lot,” he said.
“But we can’t ask him to score in every game and do what he did in his first season when he did what he did in his first five matches I think – something like that.
“Now he is playing left so we have to be patient with him.
“He gives us a lot of things and the most important thing for me is his defence, the way he reacts when we don’t have the ball so we are very happy with him.
“We have talented players up front so we are very happy with that – Anthony, Marcus, Micki [Henrikh Mkhitaryan] is in a very good moment, Juan is always scoring and creating and assisting.
“We are very good in those positions so we will find the goals.”
He has gone 15 games for club and country without a goal, but this is mainly because he’s been playing out wide to accommodate Zlatan Ibrahimovic‘s arrival.
Even though he’s better in a central role, Rashford has worked hard to get back into the side on the wings and has played a big role under Mourinho.
The experience will be brilliant for his development and there’s no doubt he’ll be able to make the striker role his own once the big Swede decides to take his career elsewhere.