The attacker has been reduced to the role of a bit-part player at the Santiago Bernabeu and is apparently open to the idea of going home to boost his 2014 World Cup hopes
The 30-year-old Brazilian has been beset by injury problems ever since he joined Los Blancos from AC Milan in 2009 and, despite an upturn in his form this season, he is expected to leave the Spanish capital this summer, with Paris Saint-Germain said to be leading the chase for his signature.
However, Sao Paulo have now apparently entered the fray, with AS revealing that Kaka dined with Cunha in the Brazilian city last Thursday.
The paper claims that the Tricolor are confident of being able to meet the attacking midfielder's wage demands with the support of some high-profile sponsors.
The major stumbling block would likely be the transfer fee, with Sao Paulo not in a position to match the €25 million PSG are reportedly willing to offer Madrid for the former Ballon d'Or winner.
Kaka, for his part, has repeatedly stated that he wants to remain at the Santiago Bernabeu and prove his worth to the club, but it is believed that he would consider returning home in order to boost his hopes of being including in Brazil's 2014 World Cup squad.