It's extremely high praise but it seems like it might be a little over the top, especially as Hazard wasn't able to beat players in Europe to crown of best player in the Premier League last season or at the World Cup.
But Sarri is looking for better things from his squad.
"He's a target man, maybe the best in the world".
The Stamford Bridge outfit have made a ideal start to the season, winning all five of their opening Premier League games and they now sit joint top of the table with Jurgen Klopp's Liverpool.
'He's got so much ability, and works hard for the team as well, when you throw that in the mix, he's one of these that you need to keep educating, keep testing him in regards to whether you can improve him, but also make sure you tell him how well he is doing'. The Belgian says he is happy despite failing to secure his dream move to Real Madrid in the summer, and he is enjoying a freer role than the one Antonio Conte afforded him. "But Hazard can improve more".
While Sarri's approach will see Hazard scoring many more goals it will take something away from his game. Giroud laid on the assists for the first two of his teammate's three goals on the day.
He hit the bottom corner after dancing round two defenders to shoot low in the 37th minute, then scored after the Frenchman held up the ball at full stretch in the 44th.
The player's current deal at the Bridge has less than a year left to run out, but Chelsea are ready to offer him a new £125,000-a-week contract.
"We have a lot of freedom on the pitch and, at the moment, when we try and do something it's coming off", he said. "I think so", the Belgium star told BBC Sport. "I'm always trying to do more - create more chances, score more goals, and today [I scored] a hat-trick so I will try to do this more".