According to the Daily Telegraph, Sarri has now loosened Conte's restriction on the players' nutrition and has given his squad more options to eat at the club's training ground.
Willian insists there is "no chance" he would still be a Chelsea player if Antonio Conte had remained in charge at Stamford Bridge, Skysports reports.
The 30-year-old Brazil global assisted N'Golo Kante's opening goal as Chelsea recorded a 3-0 win over Huddersfield Town in Sarri's first league match in charge last Saturday.
With Conte away from the club, Willian has now revealed that if the Italian had stayed with the Blues, he would have had no choice but to move away from the club this summer. "I will only leave if Chelsea want me to go".
The youngster started in our Community Shield loss to Manchester City but he also started in our 3-0 win over Huddersfield on the opening day of the Premier League. I want to be scoring goals, creating goals and, towards the end of the season, there will hopefully be a prize, with a trophy or a couple of trophies.More news: European Union seeks safe harbor for ship carrying 141 rescued migrants
Sarri has warned it will take time to master the brand of free-flowing attacking football he implemented at Napoli.
Loftus-Cheek will hope to get more minutes on the pitch this weekend when Chelsea host Arsenal in an intriguing encounter at Stamford Bridge on Saturday (5.30pm). Conte won just one of eight meetings against their London rivals, but Willian expects a different outcome thanks to Sarri's approach.
Speaking to reporters (via ESPN) Willian said: "I'm here".
He continued: "We had a period at the start where we didn't get a win for seven games. Now we have a different style, that's why we can create problems for Arsenal".