Queens Park Rangers manager has likened the club's playmaker Adel Taarabt to former West Ham star Paolo Di Canio.
Taarabt, 23, bagged a brace for Rangers as they beat Fulham 2-1 and lifted themselves off the bottom of the league table giving the west London club renewed hope of Premier League survival.
"He's got ability like not many people you've ever seen in your life," Redknapp said. "He's like Di Canio, who I thought was a fantastic player, one of the all-time greats at West Ham. This boy is the same.
"It was one of the all-time great performances, I felt."
Redknapp sold Taarabt to QPR when he was Tottenham boss and the Moroccan has since helped Rangers to Premier League promotion and survival.
"I sold him when I was at Tottenham and he knows he was not a player I wanted to sell," Redknapp added.
"When he used to come back and see his mates at Tottenham I used to say: "You are making me look a fool Adel, you are worth £20 million now and I sold you too cheap'.
"He's grown up a bit now, he's better than he was. He was a complete fruitcake at Tottenham."