Everton announced on Monday that they have sold Belgium international midfielder Marouane Fellaini to Premier League champions Manchester United for a fee of £27.5 million ($42.7 million, 32.4 million euros).
The deal for the 25-year-old was announced on the Everton website an hour after the close-season transfer window closed at 2200GMT.
"Marouane Fellaini has moved to Manchester United for a £27.5 million fee," Everton said in a statement.
"Fellaini's exit ended a summer-long period of speculation after the Belgium international emerged as one of former Everton manager David Moyes' prime targets for his new club."
The move reunites Fellaini with new United manager Moyes, who brought the Belgian to England from Standard Liege in 2008 during his time as Everton coach.
Fellaini becomes United's second close-season signing, after Uruguayan full-back Guillermo Varela joined from Penarol in June.
United were also reported to have submitted an offer to sign Portuguese left-back Fabio Coentrao from Real Madrid on a season-long loan.
However, a mooted move for Athletic Bilbao midfielder Ander Herrera was reported to have collapsed.