The Italian was surprisingly still in charge of the English club when they resumed pre-season training earlier this week, but reports on Thursday claimed that he had left his role. The Italian is also unhappy with his overall treatment from the club and the delay in his departure - with only a month to go before the 2018/19 Premier League campaig begins.
Conte has been on the verge of an exit since the closing stages of the 2017-18 season, but due to a multitude of reasons, the club have dallied in making it official.
Conte won the Premier League in his first season and the FA Cup in May, but the team finished fifth in the league last season, missing out on Champions League qualification. Despite this, they managed to pick up some silverware by beating Manchester United 1-0 in the FA Cup final in May, though Conte had been anticipating the sack this summer.
The exuberant, passionate and, at times, bonkers Italian was popular among many Chelsea fans and there was lots of support for him after his tenure finally came to an end.
Sarri, who split his time between banking and playing football before he took up coaching aged 40, has not won a major honour in three years at Napoli but has guided the club to finishes of second, third and second again.
And after Napoli announced that former Chelsea boss Carlo Ancelotti will be taking charge for the upcoming season, Sarri's arrival in West London seemed imminent.
If Conte had quit and taken another job, it would have eased the cost of Chelsea's latest managerial change.