The Brazilian star has left AC Milan and will move to the MLS expansion side following a loan stint with Sao Paulo.
Sao Paulo vice president Ataide Gil Guerreiro on Monday said the 32-year-old would return to his first club before making the move to Orlando, and Kaka has now confirmed the arrangement.
"I took a few days to think about my future, and I took the decision to go to play in America. I always wanted to go there," Kaka told the AC Milan Channel. "I'll play first with Sao Paolo and then I will go to Orlando, which is a nice project. I am very happy to be able to play again, even if for a short time, in the colors of Sao Paolo."
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The Brazilian returned to San Siro last summer after a disappointing spell at Real Madrid, but was unable to prevent the Rossoneri's decline as they missed out on qualifying for European soccer.
Kaka also revealed that he would no longer wear No. 22, which he sported at Milan.
"I will have No. 8 in Brazil and 10 in America. I'm not using No. 22, that I had at AC Milan, anymore," Kaka said. "It was a difficult year, but it represents an honor for me to exceed 300 appearances and 100 goals in a Rossoneri shirt.
"I have not left Milan because we are not in the Champions League, I made the choice for other [reasons]. Even if I go back to Brazil and begin a new adventure in America, I will miss the chorus of the fans. The relationsip with this club will alway be close.
"I will always be a supporter of Milan, I hope to send messages as soon as possible to [vice president Adriano] Galliani about our [success] in Italy and Europe. I leave many friends here."