Marcus Rashford (Getty Images)
The two Manchester United players are in the England squad that is preparing for the tournament to be staged in Russia.
Young feels his young teammate has the potential to be among the best players in the world and has the right attitude to achieve that.
Rashford is heading to his second tournament with England having become the youngest Three Lions player to feature in a major competition, when he came from the bench in the 2-1 win over Wales at Euro 2016.
“He's one of them that the manager has to tell him 'come inside' because he wants to stay out and play non-stop.
“I've said it since I saw him in the youth team; he has a massive future ahead of him. He's a fantastic player and if he keeps on going the way he is he can set the world alight.
“The World Cup can be a stage for him to show everyone just how far he has come since he made his debut.
“If you look at the goals Rashford scored on how many different debuts - that just shows that he steps up for the big games. He can produce. He's been fantastic for us at Manchester United and he will definitely be a major player for us at the World Cup."