The 17-year-old forward has drawn Compare with Brazil and PSG Superstar Neymar and was also being an attempt by Liverpool, Shakhtar Donetsk, and leading Spanish clubs.
But Manchester City has won the race to sign the wonder-kid, who has scored 2 goals in the first 6 team appearances for Fluminense in their state championship this year.
The Italian football journalist Fabrizio Romano reports that says Kayky will arrive in Manchester city next year and personal terms have been agreed for a 5-year contract.
Man city will pay Fluminense an initial £8.5million with add-ons to the following which could take the eventual transfer fee to around £15million. The Brazilian club will also receive a percentage of money for any future sale.