Injuries and a strained relationship with Antonio Conte had cast Luiz's Chelsea future into doubt at the end of last season, but under Sarri it seems that the 31-year-old will not be leaving Stamford Bridge any time soon.
When asked if he would be at Chelsea with Conte still at the helm, he told the London Evening Standard: "No chance. No".
The Brazilian said there was "no chance' he would still be at Stamford Bridge if the Italian gaffer was not sacked. I believe we pushed them (City) more than Chelsea did in the Community Shield".
The Brazilian defender earned plaudits from Sarri following his first Premier League outing since February 5 as the Blues comfortably beat Huddersfield 3-0.
"Now we have to continue like that because we have a great game to play against Arsenal". I very much enjoy his attitude when I am working with him, " he said.
"This is what we do in Brazil and are trying to do here, playing with skill and movement and the manager told us to do that".
"But I think we have been doing really well and we need to adjust a few things but I think we are on a good way. Players like that want to play football", Willian added. "This is what we will try to do this season".
"I'm here", Willian said.
The Blues are expected to battle Arsenal in a London derby this weekend - a side Chelsea haven't beaten in their last six meetings. It is always hard against them. "He is also a very good player and a very good defender".
"Obviously, today we faced probably the biggest favourite to win the title, next week we have another big game but we will be better prepared because we have this game behind us".