The Netherlands international became Ole Gunnar Solskjaer’s first signing of the summer transfer window on Wednesday evening, signing a five-year deal with the option of a further year.
The 23-year-old has since changed his profile picture across his social media channels to an image of him smiling in a United top with a thumbs up.
Van de Beek will wear the no34 shirt at Old Trafford, a tribute to former Ajax team-mate Abdelhak Nouri, who collapsed and suffered a cardiac arrhythmia attack during a pre-season game in 2017.
Nouri’s career was cut short with van de Beek paying tribute to a teammate with whom he came through the Ajax ranks with.
Van de Beek said: “This is a special thing for me because my good friend Abdelhak Nouri… maybe you know the story.
“He had a heart attack and he’s a good friend of mine, and I’m really close with his family and his brother is one of my best friends, and I talk a lot with them. So I decided to take his old number on my shirt. I want to get good memories with this number.”