The young winger recently joined up with his new team-mates after moving from Fluminense
Brazilian legend Rivaldo believes Manchester City wonderkid Kayky can become a star for the club within a few years.
Kayky made a £9 million ($12.3m) move to Manchester from Fluminense, where he made 32 senior appearances while scoring three goals and adding two assists.
The Brazilian officially joined up with the club last week, having previously been expected to move in January, and began training with his new team-mates last Friday.