The Brazilian defender is keen to return to Real when his contract in Istanbul expires.
“In Madrid I spent many wonderful years, I’ve won everything and I consider it my home,” the 36-year-old told AS.
“I would be prepared to play for six months at Real Madrid without being paid anything.
“From January to June, perhaps longer, I could stay about a year more.”
He added: “It’s my third season there, but I have decided I will leave in December.
“It is very important for me to return to Real Madrid, of course I would like as a player, but if possible I would like to work here with children, young people and teach them everything I know.”
