Argentina forward Sergio Aguero [ Images ] has completed his move to big-spending Manchester City [ Images ] from Atletico Madrid, he said on his Twitter feed on Wednesday.

"Now I am a City player," Aguero, who is known as 'Kun' after a Japanese cartoon character, said on the feed, which can be reached via a link on his official website (www.sergioaguero.com).

"Happy to be at this club and in this city," added the 23-year-old. "Thank you to everyone for the welcome and the reception."

A separate statement posted on his website later on Wednesday said he had passed a medical and signed his contract.

One of the most sought-after forwards in world soccer, Aguero announced at the end of May he wanted to leave Atletico, who unlike City missed out on a place on next season's Champions League [ Images ], Europe's elite club competition.

Spanish media reported the English Premier League side had agreed to pay 45 million euros ($65.4 million) to secure his services and he is expected to replace unsettled compatriot Carlos Tevez [ Images ].

Juventus [ Images ] had also been chasing Aguero, who upstaged teammate Lionel Messi [ Images ] of Barcelona [ Images ] at the Copa America by scoring three times in four games.

He was one of the few bright spots for the hosts, who bowed out at the quarter-final stage after a penalty shootout defeat to eventual champions Uruguay.

Married to one of Diego Maradona's [ Images ] daughters, Aguero has spent five seasons at Atletico, where he won the Europa League [ Images ] in 2009-10.

He was raised at Independiente where he made his professional debut as a 15-year-old.