Cristiano Ronaldo's motivation to stay at the top of world football comes from his rivalry with Barcelona star Lionel Messi, Kaka says.
Ronaldo and Messi have been regarded as the best players in the world for over a decade, having won five Ballons d'Or each while in competition at Real Madrid and Barcelona.
The Portuguese attacker has maintained his incredible form since leaving Madrid for Juventus, having already scored 24 times in 36 games in all competitions.
At 34, Ronaldo is showing no sign of slowing down and former Madrid and AC Milan hero Kaka believes he is spurred on by his desire to stay ahead of Messi.
"It doesn't surprise me for what it is, it surprises me because he's still at this level," Kaka told La Gazzetta dello Sport of the Juventus star.
"I believe there is also a Messi effect, the infinite challenge, this desire to always outdo himself. At 34 and after so many successes, Cristiano still finds surprising motivations."
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