Sandro signed for La Real on Thursday after passing his medical, he joins on a straight loan without the option to buy.
"In the LaLiga, I have done well and now I have a new opportunity and a new challenge ahead, I arrive in a strong team and I am very committed," said Sandro.
"I am a player who characterises myself as one for scoring goals. I cannot say a number, what I can promise is work, humility and I'm going to leave everything for the Real.
"There is a very good squad, I know many players, we have a very good coach and I am sure that we will do our best."