“He's a player full of confidence at the moment, he's in the form of his life," he told BT Sport.
“Chelsea brought him in as a youngster, as an inexperienced player and he was playing almost as a winger, out wide in these areas.
“He almost had a job to create for other people, for other big names in the Chelsea team.
“He's 30-40 yards away from goal and he plays safe, you can see he's very young and he just wants to do the right thing for the team.
“So with his experience and evolving as a talent, he's finding himself between the sticks more.
“You see where his receiving positions are in this team compared to Chelsea, it's a lot closer to the goal and it's between the sticks. That's where goals come from.
“If you're a winger and you play wide, it's impossible to hit the numbers he's got at the moment for Liverpool.
“It's unbelievable to watch him, he's a special, special talent."