The Bayern Munich midfielder's move to Barca will be rubberstamped on Monday at the Nou Camp.
During his time at the Allianz Arena, Vidal won three Bundesliga titles and the German Cup.
The right-sided player made over 50 appearances for the Catalan giants during his three seasons at the club, but has now secured a return to the Estadio Ramon for the 2018-19 campaign.
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Given that he nearly guarantees a title triumph - having won the league with Juventus and then Bayern in each of the last seven seasons - will this be a decision that United and City live to regret?
"FC Barcelona publicly expresses its gratitude to Aleix Vidal for his commitment and dedication and wishes him luck and success in the future".
The 31-year-old Chilean played 124 games for Bayern.
Vidal signed for Barcelona in the summer of 2015 but could not make his debut for the club until January 2016 due to their ban of registering new players. I enjoyed my stay in Munich very much.