Antonio Conte releases a statement following his Chelsea sacking last week, thanking his players and staff for all their "hard work and support" over the past two years.
He becomes their ninth full-time manager since Roman Abramovich bought the club in 2013.
As recently as Thursday, Jorginho told City that he preferred to join them, but sources told ESPN FC he was "bullied" into a move to Chelsea with the threat of being forced to see out the remaining two years of his contract with Napoli.
Chelsea's Director, Marina Granovskaia welcomed Sarri to the club and his football philosophy to the club. His energy and enthusiasm for football has been infectious and it has been a privilege to have one of the best coaches in the world working in the Premier League to raise the standard of the league and his players at Chelsea.More news: After Alaska closings, just 1 Blockbuster left in US
Conte's position has been under scrutiny since the middle of last season when relations with the board became strained amid a feeble title defence.
He was attached to the global department, which involved business trips to Europe's financial centres, including the City of London - but the role never stoked his imagination quite like football did.
Maurizio Sarri had to defend himself against accusations of homophobia and sexism while interviewing for the Chelsea job.
Sarri never made it as a player and, unable to make a living as a footballer, he worked as a foreign currency trader at the Banca Toscana.More news: Croatia coach Dalic: Fatigue not an issue for us
Chelsea striker Alvaro Morata's future remains in doubt following a disappointing debut season at the Blues.
More new faces are expected to arrive before the Premier League season begins in August, but Sarri is confident that Chelsea's squad will not require an overhaul to adapt to his ideas.
Sarri's first competitive match is against Manchester City in the Community Shield at Wembley on Sunday, August 5.
Chelsea are already a week into their pre-season training, but the 59-year-old is eager to get started in his new post.More news: Netflix shares tank after big miss on subscriber growth
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