Kaka labelled Lionel Messi a "genius" as he picked the Barcelona superstar over Juventus' Cristiano Ronaldo despite playing with the Portuguese attacker at Real Madrid.
Messi – winner of a record six Ballons d'Or – and Ronaldo are regarded as two of the greatest ever players, with debate often centred on who stands alone atop the all-time list.
Kaka played alongside Ronaldo at the Bernabeu between 2009-13, but the 2007 Ballon d'Or winner selected Messi as his preferred choice.
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"I played with Cristiano and he's really amazing, but I'll go with Messi," Kaka said when asked who he would pick out of Messi or Ronaldo during an Instagram Live Q&A for FIFA's channel.