The 27-year-old, who played for Ivory Coast at this summer's World Cup, was told he was surplus to requirements at the Catalan club last week.

"This is another fantastic signing for Manchester City," manager Roberto Mancini told the club's website.

Toure's arrival follows deals for Spain midfielder David Silva and Germany defender Jerome Boateng.

The transfer fee for Toure, who will enjoy a three-week break before joining his new team-mates for pre-season training, takes the club's summer outlay to about £60m - still some way short of last season's £120m spending spree.