The Tottenham Hotspur defender impressed once more against West Ham on Sunday afternoon.
Tottenham signed the centre-back from Atletico Madrid for an £11.5 million fee this summer, as reported by the Daily Mail, and has made a big impression since.
Redknapp admits he has been impressed with him during the Belgian's White Hart Lane career and praised him for the goal he scored against West Ham in particular.
The 26-year-old rose above Andy Carroll of all people - with ease - to head home - and the pundit believes that kind of aerial prowess is an example to any and every footballer, whether they are a forward or a defender.
Redknapp told Sky Sports during the half-time break: "I’ve been really impressed with him since he joined. He’s not the biggest player in the world but he rises above Andy Carroll.
"That’s how you should attack the ball, I don't care whether you’re a forward or a defender."
The 26-year-old certainly adds a lot of value in north London.
Not only is the Spurs centre-back extremely solid in defence, he contributes in attack, often getting forward to get involved in forward moves and, as Redknapp states, getting forward for set-pieces.
In terms of quality signings, the Belgian is one of Tottenham's best in years already.