The Brazilian midfielder has long been linked with a move to White Hart Lane.
The 21-year-old will join Spurs if he passes a medical and is awarded a work permit.
“It would be fantastic,” said Redknapp. “The chairman has been dealing with it. I got a phone call this morning from the chairman saying that he thought we were close to doing it.
“Hopefully it will get done now and it will be a good signing.
“He is an outstanding young player. He is on the verge of the Brazilian team. He has already played for Brazil and captained the Under-18s, 19s and 21s.
“He is strong. He looks a very, very good player so I am looking forward to getting him here.”
