Hazard's first two goals came from layoffs by Olivier Giroud.
Chelsea's ideal winning start to the season is papering over the lack of firepower from their big money signing Alvaro Morata, and with Olivier Giroud hardly prolific, the big priority in the new year is likely to get another goalscorer through the door - a move for Mitrovic would be surprising but he indeed appears to be on the radar.
The Liverpool forward won the Golden Boot last season and Sarri is backing Hazard to dethrone the Egyptian this campaign.
Hazard has found the net five times in as many league matches, and is brimming with confidence after Sarri told him to chase 40 goals this season.
'When he gets the ball he can hold the ball and we can go with him in deep.
However, according to Giroud, his colleague still has a big part to play for Chelsea, with both men vying for a starting spot in Sarri's line-up, as he told reporters on Monday: "It has always been a fair competition between us and we will both try to step up to help the team reach our target". We are very ambitious, so every game is very important.
Sarri tips Hazard for EPL Golden Boot
"Eight players joined us this summer", he said.
"I want to speak with him and I want to speak to the doctor and then I will decide".
Cardiff took a shock lead through defender Sol Bamba's tidy finish, as the visitors pulled off a smart training-ground move.
"So, we have a lot of good players, and at the moment we are in confidence, so we shoot, we score".
"When I'm on the pitch I'm just trying to create chances, score goals".