Ronaldo, a United legend and fan favorite is a five-time Ballon d’Or winner, has so far won over 30 major trophies during his career, including five UEFA Champions League titles, four FIFA Club World Cups, seven league titles in England, Spain and Italy, and the European Championship for his native Portugal.
In his first spell for Manchester United, he scored 118 goals in 292 games.
A statement from United read “Manchester United is delighted to confirm that the club has reached agreement with Juventus for the transfer of Cristiano Ronaldo, subject to agreement of personal terms, visa and medical”
The Portugal international left for Real Madrid in 2009 for a then world record fee of £80 million but will now make an emotional return.
Manchester City were one of the clubs who looked at the possibility but on Friday sources told ESPN they had pulled out of the race.
Rio Ferdinand has confirmed he spoke to his former United teammate asking him not to move to the Etihad Stadium.
Talks between Ronaldo, United and Juventus began on Thursday night.
Ronaldo did not train with Juventus on Friday, and instead left Italy on a private jet. Juventus manager Massimiliano Allegri later confirmed he had asked to leave the club before the transfer deadline on Aug. 31.