Robinho has been linked with a return to Brazil this summer.
"For Santos I am always available," the player told Radio 650 in Boston.
"I am good friends with the President, Luis Alvaro, and we talk frequently. It is true that Santos recent asked Milan about signing me, but they refused the offer.
"It is a fact that if in the future there should arrive a new offer, I would be ready to take it into consideration."