But Sarri is looking for better things from his squad.
The Citizens lifted the league title last term under Pep Guardiola in a scintillating manner, with Chelsea finishing 5th in the standings.
Liverpool's Brazilian midfielder Roberto Firmino (C) celebrates after scoring their second goal with Liverpool's English defender Trent Alexander-Arnold (L) and Liverpool's Egyptian midfielder Mohamed Salah during the English Premier League football match between Tottenham Hotspur and Liverpool at Wembley Stadium in London, on September 15, 2018.
"I think at this moment Liverpool and Man City are another step ahead of us but I think we can improve". Playing away at one of the Premier Leagues top clubs, Cardiff would have been forgiven for locking up but they very much played the way they wanted to play. Now I have changed my mind: maybe he is the best.More news: Over 1 million people evacuated from coast as Hurricane Florence bears down
Hazard struck twice in seven first-half minutes to put Chelsea in control at Stamford Bridge after Sol Bamba's volley gave Cardiff the lead, and he converted a penalty 10 minutes from time to make sure of the win before substitute Willian curled in a late fourth.
Cardiff had picked up just two points in 0-0 draws with a man advantage against Newcastle and Huddersfield prior to their visit to the capital. They've been one of the more prolific teams in the Premier League, likely due to Sarri's emphasis on attack-minded play.
Hazard's rescue act, hasty though it was, would not have been needed had Croatia global Kovacic made the most of his two earlier opportunities. Giroud laid on the assists for the first two of his teammate's three goals on the day. Now he thought the Belgian might even be the best.
"I've been trying to stress this number to my players (to avoid a drop-off in performance) and telling them my experience in this situation".
Hazard scored his third goal in the 80th minute via a penalty before Brazil worldwide Willian netted the fourth and last goal for the Blues to win the match 4-1.