The 10-time capped Netherlands midfielder has become the further major arrival of the summer at Old Trafford
The 23-year-old joins on a five-year deal with the option to extend for an additional season.
Terms of the deal were agreed on Sunday between the clubs, and the transfer has now been made official by the Old Trafford side after they reached an accord over personal terms with the player, who has also passed a medical.
Van de Beek, who was not involved as Ajax tackled Eintracht Frankfurt and Union Berlin in friendlies over the weekend, has therefore become United’s first signing of the 2020 summer transfer window.
Rafael van der Vaart, another Ajax academy alumnus who ultimately made his way to the Premier League with Tottenham, has explained that he expects the 23-year-old to be a big hit in England.
“Donny deserves this transfer so much,” Van der Vaart told NOS. “He has played excellently for Ajax.
“And Manchester United really need this kind of player in their team. This transfer is fantastic for us [Dutch people] too. We are all going to follow him now. This move is so deserved.”
Van de Beek has spent the last five years in Ajax’s first team, having been promoted from the reserves. He has made close to 200 appearances in all competitions for the Amsterdam outfit and has scored 41 goals for the club while laying on a further 34 for others.
One of the highlights of his time with Ajax, where he won the 2018-19 Eredivisie title, was the run to the Champions League semi-finals in that same campaign, a competition in which he was recognised as one of the star performers.
He could make his United debut in the opening match of the 2020-21 Premier League season, which will see Ole Gunnar Solskjaer’s side travel to Turf Moor to face Burnley.