The Italian manager has informed reporters that the winger expended too much energy working in his own half.
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Sarri has urged Hazard to conserve energy and believes the winger can score 30 to 40 goals this season.
Sarri: “I think Hazard can score 30 or 35 goals”
Hazard will be more effective in the final third should he learn how to conserve energy, according to the former Napoli boss.
Sarri to Hazard: “You have to spend less energy”
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Sarri utilising Hazard
Sarri has so far worked wonders with the Belgian who has shone whilst the new manager has been West London.
Hazard netted a hat-trick for Chelsea this afternoon becoming the fourth player to score multiple Premier League hat-tricks.
The 27-year-old has now been directly involved in seven goals in five appearances this season.