The playmaker scored a stylish hat-trick as the Blues coasted to a 4-1 win over Cardiff City at Stamford Bridge on Saturday.
Giroud is yet to find the net for Chelsea this season but already has three assists in five Premier League games while Hazard has found the net five times.
Therefore, Hazard is now Chelsea's tenth highest scorer, behind George Hilsdon who has 108 goals.
"I think he is right, because we are very unsafe in the defensive phase, we need to improve there", he said. "They have different characteristics, and it depends on the kind of match".
"I think both, because we have to play 60 matches".
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Chelsea sit top of the table, on goal difference, after a flawless start to the season with Sarri enjoying a remarkable start to life at Stamford Bridge.
And former Napoli manager Sarri believes Hazard has enough of an eye for goal to outscore goal-scoring rivals Harry Kane and Mohamed Salah.
"We can improve.We are not so solid as I want in the defensive phase", Sarri said, citing Cardiff's early goal from an unmarked Sol Bamba. He has to improve something, but he can do it. "If you saw the game today, you have to say yes!" He can have more energy in the last 25 metres.
"He's one of the best in Europe for sure".
"He's a target man, maybe the best in the world".
One complaint of the Belgian, who grew up idolising Zinedine Zidane, has always been that he never manages to score enough goals given his level of influence and talent.