Romelu Lukaku has completed his move from Everton to Manchester United after signing a five-year contract.
After confirming on Saturday that a transfer for Lukaku had been agreed, United announced on Monday that the Belgian striker had agreed personal terms and completed a medical.
The 24-year-old, who told ESPN FC he will wear the No. 9 shirt, will be reunited with manager Jose Mourinho, for whom he previously played at Chelsea. It was the Portuguese coach who sanctioned Lukaku's £28 million sale to Everton in 2014.
"Romelu is a natural fit for Manchester United," Mourinho said in a statement. "He is a big personality and a big player. It is only natural that he wants to develop his career at the biggest club.
"He will be a great addition to the group and I know they will make him very welcome. I am really looking forward to working with him again."
The contract runs until 2022 and includes an option to extend it for another season. ESPN FC sources and multiple reports said United will pay Everton an initial transfer fee of £75 million.
United's announcement of Lukaku came just hours after longtime forward Wayne Rooney took to the training pitch at Everton after completing his move in the opposite direction.
Lukaku is eligible to make his United debut on Saturday against the LA Galaxy in Southern California or in next week's game against Real Salt Lake in Utah.
United's in-house station MUTV previously reported that Mourinho had told them "Romelu" would not face the Galaxy, but later confirmed the coach had been referring to goalkeeper Sergio Romero.
During three seasons at Everton, Lukaku became one of the Premier League's most prolific strikers, scoring 71 goals in 133 games.
He scored 25 Premier League goals last season and was only beaten to the Golden Boot by Tottenham Hotspur's Harry Kane.
"I would like to start by thanking Everton and the fans for the last four wonderful seasons, I have made some special friends and we have shared some amazing moments," Lukaku said.
"However, when Manchester United and Jose Mourinho come knocking at the door, it is an opportunity of a lifetime and one that I could not turn down. You could see the fight, determination and the spirit in this team during the Europa League final and I want to become a part of that.
"I cannot wait to run out at Old Trafford in front of 75,000 fans, but before that preseason is where the hard work starts, and I am looking forward to that first training session."
United had been heavily linked with a move for Real Madrid striker Alvaro Morata, but their interest in the Spain international has now ended with the capture of Lukaku.