Napoli's president revealed Sarri was close to finalising a deal to take over at Chelsea on Wednesday, two days before Conte's sacking was confirmed by the Premier League club.
Conte's relationship with the Chelsea hierarchy had soured in the final year at the helm of the club regarding transfers.
Conte equalled the Premier League record for for consecutive wins (13), and the record number of wins in a season (30) when leading Chelsea to the title in 2016/17 season.
"Chelsea Football Club and Antonio Conte have parted company", Chelsea said on their website.
Conte is not happy at how his dismissal was handled, particularly after he came back to take pre-season training at Cobham this week. "I wish you every success in the future".
Two trophies in two seasons but the writing was on the wall. He had been waiting since winning the FA Cup in May to resolve his future at Stamford Bridge, but difficulty in securing Sarri delayed the process.
Media reports said Conte's departure would take to 85 million pounds the amount Chelsea has spent on paying off sacked managers - nearly the record fee Manchester United paid in 2016 for France midfielder Paul Pogba.
The 59-year-old coach was replaced by Carlo Ancelotti in Naples this summer but he wasn't released from his contract.
Giovanni Martusciello, who is now the technical collaborator of Inter Milan, has reportedly turned down the chance to join Maurizio Sarri's coaching staff at Chelsea. Each of these three players, among others, thrived under the tutelage of Sarri and that will be fascinating for Chelsea fans heading into the new ere.