Toure joins City from Arsenal for a fee reported to be around £16million.
Toure has signed a four-year contract with City.
“I am delighted to welcome Kolo to Manchester City,” City boss Mark Hughes told the club’s official website.
“It is no secret that we have been looking to strengthen our defence, and in Kolo I feel we have recruited a world-class player. He brings a wealth of Premier League experience from his seven seasons with Arsenal.
“Kolo has been a central figure in a very strong Arsenal team for many years, and I have been an admirer of him for a long time. He is strong, quick, reads the game well and will be an influential figure in the dressing room.”
