The midfielder has joined Taarabt on-loan at Milan.
"I hope he does well there, good luck to him," Redknapp said. "He went to Fulham but it didn't work out, he couldn't get a game.
"It's an amazing game, isn't it? You can't get a game at Fulham at the bottom of the Premier League and then you go to Milan!
"Years ago to get to Milan you had to be a world-class superstar.
"So it's a great move for him and I hope he knuckles down and does well. He's got the talent, it's just himself."