Robinho has endured an injury-hit season at Milan, but offered a reminder of his value by scoring the only goal against champions Juventus at the weekend.
The 28-year-old is aware of interest from several Brazilian clubs and will not rule out signing for a team other than his old side Santos.
"We never know what will happen tomorrow in football but I can't say I wouldn't play for another team, although I make it clear that Santos are the club I love," Robinho told Lancenet.
"I've been sounded out by Gremio, Atletico Mineiro and even a rival Sao Paulo. Let's see what happens."
Robinho originally left Santos for Real Madrid in 2005 and returned on loan in 2010 after struggling to make a sustained impact at Manchester City.
He left City permanently that same summer to join Milan and signed a four-year contract upon his arrival at the San Siro.