Sandro joined for £6.5million in March, but stayed in Brazil to help his club win the Copa Libertadores, the South American equivalent of the Champions League, last month. He will make his debut against Arsenal tonight.
"He's like Socrates," said Redknapp, searching for comparisons. "He looks like him, he runs like him. If he can play like him, we'll be all right. He's not a Robinho. He's a big lad, he gets around the pitch, he can tackle, he can pass it and play.
"He's a good all-round holding player. He's a big, rangy, box-to-box midfielder. Maybe a Vieira type. And he's a great lad, a really lovely fella, totally dedicated to his football. He's not going to go off Samba dancing anywhere."