The Italian took charge during the summer after leaving his post at Serie A giants Napoli.
The Blues are looking to bounce back from a disappointing final campaign under Antonio Conte that saw them finish fifth and fail to qualify for the Champions League.
Sarri has gone back to basics by scrapping Conte’s three-man defence.
And the 59-year-old is looking to implement ‘Sarri-ball’, a high-pressing, possession-based style he became famous for in Italy, orchestrated by summer signing Jorginho in the heart of midfield.
“City or Liverpool.”
Chelsea boss Maurizio Sarri
Chelsea have won all four of their Premier League games so far this season and sit level on points with Liverpool and Watford at the top of the table.
Manchester City romped to the title last term and many have tipped this season’s competition to be a two-horse race, with Liverpool the hot favourites to challenge Pep Guardiola’s side.
And Sarri agrees, insisting it’s too big an ask for Chelsea to have a realistic chance of finishing top.
“At the moment I can answer City or Liverpool,” he said.
“We need another step I think to reach another level.
“I think so (this season is too soon), I hope now.
“The gap was 30 points so to cover 30 points is very difficult.
“I think we need to improve, but we can.
“We are not a very solid team in the defensive phase.
“We can improve and will improve.”
Chelsea return to Premier League action tomorrow afternoon as they welcome Cardiff to Stamford Bridge.
The clash kicks off at 3pm.