The former Manchester City starlet has been linked with a move to Old Trafford for a long time and he has now sealed a move that will make him the second most expensive English player.
“I’ll always be grateful to Dortmund for giving me the opportunity to play first-team football, although I always knew that I would return to England one day,” Sancho told manutd.com.
“The chance to join Manchester United is a dream come true and I just cannot wait to perform in the Premier League,” the 21-year-old added.
“This is a young and exciting squad and I know, together, we can develop into something special to bring the success that the fans deserve.”
Manchester United manager, Ole Gunnar Solskjaer has backed the new signing to be successful at Old Trafford.
“Jadon epitomises the type of player I want to bring to the club, he is a forward player in the best traditions of Manchester United,” said Solskjaer.
“He will form an integral part of my squad for years to come and we look forward to seeing him blossom,” the United manager added.
“His goals and assists records speak for themselves and he will also bring tremendous pace, flair and creativity to the team.
“Old Trafford will give him the platform he needs to release his untapped talent and perform at the highest level.
Manchester United finished 12 points behind Manchester City in the Premier League last season.