Erik ten Hag has told his young players they must earn their place in his first-team squad ahead of Manchester United's tour of Asia and Australia.
A number of youngsters have been included in United's touring party, including James Garner and Alejandro Garnacho.
And ten Hag wants to see them consistently deliver on and off the pitch.
Asked what advice he would you give to any younger players coming on the pre-season tour, the Dutchman told MUTV: "What I want to see is that they learn but also they show themselves because they have to deserve a position in top football.
"You have to deserve your position. It means you have to deliver every day, that demands a certain style, a certain way of life that they have to adapt to, that they probably don't know yet.
"But I am really looking forward to seeing if they can do it. I hope one or two, they can prove themselves and they come into the squad but, if they want to enter the dressing room, they have to deserve it."
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