However, the 20-year-old's form could see him move ahead of Sanchez in the pecking order.
Mourinho often sets up to frustrate top opponents, and it was no different on Saturday-they sat deep, drew Liverpool out, and put long balls over the top to pick on Dejan Lovren and Trent Alexander-Arnold.
"Now I have only one name in my mind: it is Sevilla".
Steven N'Zonzi of Sevilla in action with Marcus Rashford in the Round of 16 First Leg against Manchester United on 21 February 2018. "Mourinho was more than a father to me", said Julio Cesar, the Brazilian goalkeeper. Paul Pogba's availability is doubtful, with the Frenchman not training much since sustaining a knock in training last weekend. Danny Makkelie will take charge of his first United game and lead a Dutch team of officials on Tuesday night.
"Personally, taking the confidence from this game into the next games is important". But unlike so many other days this season, the offense just wasn't clicking.
Liverpool had more possession and did more with the ball than United, but against a Jose Mourinho side having more possession and doing more with the ball often doesn't end up with three points given the Portuguese manager's tactical tendencies.
But away from the field Rashford does not feel the need to express any frustration to Mourinho, thanks to maturity that belies his age.
"When I say Liverpool, it is just to say that Sevilla is a really good team and the result of the first leg is a result that leaves everything open for tomorrow". "In football you are going to be up, you're going to be down".More news: Prince William may 'walk Meghan Markle down the aisle' at Royal Wedding
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The challenge for Mourinho is to pass on his knowledge of how to handle the big occasions, especially the more inexperienced ones in his squad.
"It is a game that we must interpret every situation, defending and attacking when necessary".
"We are all in it together".
"I try to give the best to the kids, education". It is because of these players that the first 11 could not be rested often even in easier matches.
Plus, there is little chance for Rashford to get down when he is around the likes of outgoing team-mate and close friend Jesse Lingard - an academy graduate whose patience eventually paid dividends at United.
"Now I have only one name and that is Sevilla, I know is very hard to go through".
"He's inconsistent at the moment, but he's a world class player and he will come good".
"Probably you are not expecting my answer - I'm happy with the decision", he told reporters. "It's something that you have got to accept".
He said: "We have to forget this defeat and think about Tuesday".