Kaka came close to joining Manchester City in January and is now being linked with a summer transfer to Real Madrid.
“I would be happier if Kaka stayed at Milan,” Laporta told La Gazzetta dello Sport. “He is a world-class player and I would tell him not to leave the Rossoneri, who are a great club.”
Laporta also believes Frank Rijkaard is the right man to succeed Carlo Ancelotti at the San Siro.
“Frank is one of the best coaches in the world,” noted Laporta. “He would do great things at any club, even more so at Milan, where he played.
“My decision to sever our ties with him was the hardest I ever made during my tenure and I almost cried when we said our goodbyes.”