The Chelsea boss thinks his superstar forward wastes too much energy in his own half despite watching him bag three against Cardiff.
And while he claimed Prem top scorer Hazard – who has five goals this season – is probably the best player in Europe, Sarri is adamant he needs to work on his game.
He said: "I thought that Hazard was one of the best players in Europe – but now I'm changing my mind. Maybe he's the best player.
"I think Hazard can improve more, he can spend less energy 50-60 metres from the opposition goal.
"When we have the ball in our half, he touches the ball five or six times. This takes a lot of energy. He could score 30 or 35 goals."
Despite soaring to the top of the table with a 4-1 win, the Sarri thinks there is plenty of work to do after watching Sol Bamba's opener for the Bluebirds.
He added: "Manchester City and Liverpool are another step up to us but I think we can improve.
"Our goal is to be the best team in England but it will take time.
"It could take more than a season but that is our target. Liverpool and Manchester City are better than us.
"We are not as solid as I want in the defensive phase. We knew they were dangerous from set-pieces and we were not ready to answer."
Bluebirds boss Neil Warnock said: "I'm really disappointed with the goals we conceded it. It's a learning curve.
"We should have had a penalty when Paterson hit the post and David Luiz on the floor clearly pulls him down when he's going for the ball."
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