"He could end up going down as one of the club's great centre-backs. He's already playing international football, and to be playing regularly for Liverpool at his young age is a fantastic achievement," said the Reds' vice-captain.
"He's good on the ball and has a great left foot, but he also reads the game very well and is good in the air. He's got a lot of things going for him and he's still very young. He's only going to improve over the years.
"The way he's playing at the moment, if he can keep playing and getting experience, he is going to be a top player."