The enigmatic Brazilian fell out of favour under Antonio Conte but has now found his foot again with Sarri. The Italian loves playing attacking football, which suits Luiz just fine.
"First of all he's a great person, great as a human," the Brazil international said of Sarri in an interview with Chelsea magazine.
"I think his philosophy to live life is already great because he wants to enjoy every day, he wants to be happy and he wanted to take this opportunity to start one more chapter in his life.
"I think that is one of the most important things in life; when you love to do something, when you're happy.
"So, I believe in this philosophy, and then after that he is a great coach. He wants to play with the ball, he wants to play with intensity, to work on the details and to give us all the information he can about the next game and the opponent.
"Every week he tries to make the best plan possible for the exact game and this is great because he is working in the best way for the team, for the collective."