The young striker burst on to the scene with Manchester United last season, scoring two goals on his debut.
The 18-year-old has received a lot of praise for his performances for club and contry towards the end of last season and at Euro 2016.
Former Manchester United and Real Madrid star David Beckham seems to be a big fan of the young man.
Here is the shirt that Beckham sent. The message reads: "To Marcus, good luck and continue working hard and playing with joy + passion. Love David."
Nice touch from Becks!