BREAKING: Atletico Madrid's Sergio Aguero signs for Manchester City The Argentine prodigy has finalised a move to the Premier League giants, putting an end to one of this summer's longest transfer sagas Atletico Madrid striker Sergio Aguero has completed a switch to Manchester City, the player has announced via Twitter. "I am a City player already. I am happy to be at this club and in this city. Thank you everyone for the welcome and the reception !!!," Aguero tweeted. lock after 3 years.