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Man City announced on March 29 that Aguero's contract would not be renewed and that his 10-year stint at the club would end this summer, with Chelsea - who beat City in the Champions League Final in what was Aguero’s last game for the club - among the interested parties.
Chelsea had Aguero on their transfer shortlist in April along with the likes of Erling Haaland and Romelu Lukaku, while Tottenham's Harry Kane is also a target following the news that the striker wants to leave Spurs.
However, Aguero signed a two-year contract with Barcelona on Monday, with a buy-out clause set at 100million euros (just over £86million).
Following his unveiling at a press conference at Camp Nou, Aguero told reporters that once Barcelona were interested, he would not listen to any other offers.
"I didn't even hesitate. I didn't want someone else to talk to me, just Barca," Aguero said.
"(Pep) Guardiola, when we won the Premier League, he told me 'You're going to the best team in the world'.
"As a boy I said one day they will surely notice me and here I am."
Aguero joined City from Atletico Madrid in 2011 and went on to score 260 goals for the club, none more important than the stoppage-time strike which sealed the 2011-12 Premier League title.
His final appearance for City came in Saturday's disappointing defeat to Chelsea in the Champions League final in Porto.
In all, he won five Premier League titles, one FA Cup and six League Cups with City.
Additional reporting by PA.