Bale was given the man-of-the-match award for giving Spanish veteran Michel Salgado problems on the left flank.
"He's learning the game and growing up. He came here with a lot of hype and he's still young," Redknapp said.
"He's defended better at left-back and now he's moved to left midfield and has been equally good for me there. He has a fantastic future in front of him. He's top drawer."