Chelsea and Manchester City have been linked with the Brazilian, who has struggled to live up to his £60 million price-tag since arriving in Madrid over 18 months ago.
"There is no possibility of Kaka leaving Real Madrid," said Bronzetti. "Florentino Perez gave me this assurance. The Brazilian was one of his more expensive signings, I cannot imagine him being sold.
"Of course, the transfer market between now and June may always change, but as far as I know they are just rumours put about to sell newspapers."