DONNY VAN DE BEEK will have to "mentally adjust" as Manchester United are a "beast of a club", warned Robin Van Persie.
The Ajax midfielder has completed his medical ahead of a £40million switch to Old Trafford.
Van de Beek is expected to pen a five-year deal worth around £107,000-per-week before bonuses.
But former Red Devils forward Van Persie has warned his Dutch compatriot what to expect in the Premier League.
Writing in his column for De Telegraaf, he said: "Donny van de Beek is 23-years-old and that is a nice age to make a transfer to the Premier League.
"I was a bit younger when I went to Arsenal, and in the locker room, I was considered a player for the future.
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"Winning the UEFA Cup with Feyenoord meant nothing. The Premier League is a completely different world.
"Donny will be brought in as a major purchase from Manchester United, but he will discover that those other 22 players have also been brought in as a "major purchase". One had an even bigger transfer than the other.
"It means that he has to stand there right away and he has to mentally adjust to that. Because Manchester United is in every way a beast of a club."
Van de Beek proved his potential as he scored ten goals from midfield last season.
He has spent his entire career with Ajax after he joined the youth academy in 2014.
Solskjaer is a huge admirer of the 23-year-old – who can play in any position across the middle.
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