The Spurs boss revealed on Tuesday morning that the 21-year-old is close to signing, subject to passing a medical and receiving international clearance.
"The chairman has been dealing with it. I got a phone call this morning from him saying that he thought we were close to doing it," Redknapp has said.
"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."