The London club have won all of their four opening Premier League matches under the Italian tactician and Luiz is delighted with the Sarri's approach. He has won everything with the club, so it's up to him.
"If he wants to help us I am really very happy".
"Chelsea is his home of course", Sarri stated when asked about Terry's potential return to the club as a coach.
"Here he is a point of reference, here it is John Terry's home so he will be very important for everybody, only the presence".
"We need another step, I think, to be the same level".
"I think so. I hope not".
The Italian added: "I think tomorrow will be a very hard game because, mentally, the match after the break is always very hard. I think we need to improve".
Maurizio Sarri will be preparing his team to face a tricky and robust Cardiff City side this weekend, as Chelsea prepare to welcome the Premier League new boys.
Ruben Loftus-Cheek is a doubt for the game with an injury, while Emerson and Davide Zappacosta are also unlikely to feature.
But the timing of the fixture makes a damaging setback more likely according to Sarri, who said that he encountered a similar problem during his time in charge of Napoli.
"The feeling is always that we will win, and this is a great feeling, because I've been playing football for many, many years and if you feel that way every day, it means you're in the right place".
Sarri's smoking ban would be only temporary, "for one, two years, yes".