Rashford has found life at Manchester United tough under Jose Mourinho.
Despite shining under Louis van Gaal last term, the striker has been forced to play second fiddle to Zlatan Ibrahimovic.
The teenager has had to make do with substitute cameos off the bench, with Mourinho often choosing to deploy him on the wing.
And Rashford has admitted he has been learning how to make the most of his new role at the club.
Marcus Rashford has endured a difficult season at Manchester United
Manchester United arrive at Old Trafford for Wigan clash
Sun, January 29, 2017
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Marcus Rashford has been forced to play second fiddle to the likes of Zlatan Ibrahimovic and Wayne R
“It’s important you do that,” he told club magazine United Review.
“You don’t know where the manager is going to bring you on, so you have to do that for all the positions really.
"Just so you’re ready and mentally prepared for when you get on the pitch.
Marcus Rashford came off the bench as Manchester United lost to Hull
“So it is something you do when you’re on the bench but I think that’s only natural, for a player to be thinking about getting on the pitch, what you’re going to do when you’re out there and who you are going to come up against.”
Rashford has been named on the bench for United's FA Cup clash with Wigan this afternoon (4pm).
Wayne Rooney leads the line with Ibrahimovic given a rare day off.