Kaka also admitted the brilliance of five-time Ballon d'Or winner and Messi's arch-rival Ronaldo. The Brazilian legend feels that Ronaldo's desire to be the best is the most incredible thing he has.
Kaka earned 92 international caps in which he scored 29 goals. He has also won the Serie A and La Liga title with AC Milan and Real Madrid respectively.
In 2013, Kaka returned to AC Milan and later joined Orlando City, where he finished his career.
Coutinho joined Barcelona this month on a five-and-a-half-year contract.
The iconic Brazilian footballer called time on a glittering career that was marred by niggling injuries.
It was while at Milan that Kaka picked up the Ballon d'Or, awarded annually to the world's best player.
Will the 35-year-old return to the San Siro for a third stint sometime soon?
"I'm 35, which is an advanced age for a professional footballer," the former Real Madrid and AC Milan midfielder said.
