He added: "It was fantastic for me to be able to share my emotions, passion and enthusiasm throughout two unforgettable seasons with these wonderful Chelsea supporters, who will always stay in my heart".
In order to make sure he can communicate effectively at Chelsea, Sarri will immediately start taking English lessons at least once or twice a week while he prepares for the new season.
Before Sarri's decision to completely focus on football coaching as a career at the age of 40, he worked as a banker at Italy's Monte dei Paschi di Siena bank.
After further short stints at Alessandria and Sorrento, he seemingly settled down at Empoli for three years before upping sticks again and taking on the Napoli job in 2015. The Chelsea fans were expectedly delighted with the double announcements.
The holding player appearing in 133 Serie A games for Napoli during a four-year spell, and has also been capped for Italy.
Sarri replaced Antonio Conte as the Chelsea manager on Saturday and he has quickly got into the transfer market having signed Jorginho from Napoli and he is keen on getting Milinkovic-Savic this summer.
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But he failed to lead Milan to Champions League football, finishing sixth in Serie A, a staggering 31 points behind champions Juventus.
Sarri will be the sixth Italian to manage Chelsea after Gianluca Vialli, Claudio Ranieri, Carlo Ancelotti, Roberto di Matteo and Conte, who left with a year still on his contract. Antonio Conte only managed to gather 65 per cent winning ratio in his two years at Chelsea, while Jose Mourinho had a 62.9 per cent victory rate in his two stints at the Blue side of London.
In Naples, his ability to link defence and attack stood out.
Meanwhile, the Blues' saga with Conte may only just be beginning as the manager is poised to take legal action against the club in order to secure £9m in compensation for himself and his staff after he was dumped.
Sarri, who has beaten Manchester City to the £57m signing of midfielder Jorginho from previous employers Napoli, has promised to entertain the Chelsea fans following his confirmation as the new boss. Can they compete with the likes of Manchester City and Manchester United?