That's according to former Blues midfielder Claude Makelele, who says that he is confident the former Napoli manager will be a success.
The Blues have taken maximum points from their first four Premier League games under Sarri, and Luiz is delighted with the Italian's approach.
Sarri, 59, has since overseen a flawless start to his tenure with the Blues, winning all four Premier League matches so far.
"So it's going to be hard for them to win the Premier League".
Maybe the most pleasing aspect of his short reign though is hanging on to star man Eden Hazard after constant speculation over a move to Real Madrid.
The Belgium global was though swiftly replaced by Kepa, who signed for a world-record £71.6m fee for a goalkeeper from Athletic Bilbao.
"Look at the Champions League in 2012".
"A lot of people, they say a lot of things in the press, but I never said that I want to leave Chelsea, never", he told the club's website.
The defender has played all 90 minutes in the new Premier League season for Chelsea so far and is relishing working under Sarri. Manchester City, Manchester United, and also the smaller teams have good players.
"These kinds of players give a different story about Chelsea than the way we knew Chelsea before".
"But it's a good pressure, and I think if you don't feel this pressure you stop being the type of player to play for Chelsea".
Chelsea welcome Cardiff to Stamford Bridge when the Premier League resumes following the worldwide break.
Cesar Azpilicueta has been as reliable as every since moving back to the right side of defence while Marcos Alonso has done well at left-back so far this season so they should retain their places against Cardiff.