While Hazard inspired Chelsea to a comfortable win over Cardiff at Stamford Bridge, it was not all plain-sailing for the Blues as Sol Bamba put the Welsh side ahead in the first half.
"In the last two weeks I have seen four matches of Cardiff and four matches of PAOK Salonika and for me, I thought [on Friday] Giroud was more suitable for this match and Morata more suitable for the other", Sarri said.
"If he wants to help us, I'm very, very happy".
And Hazard hailed the freedom Sarri's set-up has offered him to get forward and try to improve on his best ever tally of 19 goals for a season in English football.
The victory means Chelsea maintain their 100% under Maurizio Sarri, while also going top of the Premier League on goal difference.
Mitrovic drew a blank against Man City on Saturday, but since rejoining the Cottagers in the summer, the 23-year old Serbian global has scored four Premier League goals in just five games - a haul that has got the attention of Chelsea as well as European suitors. Pedro's cross found Olivier Giroud, who laid the ball off for Hazard, allowing him to unleash a strike which deflected in off Bamba.More news: Canadian pot users could get flagged at U.S. border
Hazard joined Chelsea in 2012 and has scored 94 goals for the club but has never hit 20 or more club goals in all competitions in a single campaign.
"The last time I spoke with him he told me that he wants to play for another season, but I don't know the situation now", Sarri told a media conference. In this actions he spend a lot of energy. "I think he can score 30 or 35 goals".
"Mentally the match after the break is always very hard". But as I said before, my target is to become the best team in England in one year or in 18 months.
"He's a good player, isn't he?" I saw the players working every day of the week... 'Eden only arrived back two days ago (from worldwide duty).
Chelsea rebuffed interest from European champions Real Madrid for Hazard after the player himself declared an interest in moving on after the World Cup.
"But you have to spend less energy far from goal and you have to play in the last 25 metres of the field".