"There was an agreement [with the player], but there was no agreement between the clubs".
He told reporters, according to the newspaper: "It was a gamble and I'm happy to take this step, I want to enjoy it".
"I don't know why I'm not still at Napoli", he said.
Sarri said he could quite easily have remained at Napoli after taking them the closest they have been to winning the Scudetto since 1990.
Rather than build on what he had achieved, Sarri left Napoli after three years at the helm in order to join Chelsea but only after a contract dispute between him and the Italian club had been resolved.
"The release clause in my contract with Napoli expired on May 31, but De Laurentiis appointed Ancelotti on the 21st".
"Could I return to coach Napoli one day?"
Salisbury store owner believes alleged Skripal assassins were 'window shopping'
Police said they arrived in Britain from Moscow on March 2 at London's Gatwick airport on an Aeroflot flight and left on March 4. They paid a day-trip to Salisbury , a sleepy city in the southwest of England, on the Saturday to carry out reconnaissance.
"I have not won anything in Naples".
"That means his human and professional qualities are extraordinary".
The 23-year-old shot-stopper has made a solid start as the club's new number one, securing two clean sheets in the opening four games of the season as Chelsea have won all their fixtures so far.
Sarri added: "Here [football] is totally different, it's a celebration". "It's an absolute festival and a pleasure to arrive in the stadiums and see all the fans wearing different shirts but drinking beers together".
"I sign autographs for the fans of the opposing team on the sidelines, before and after the match".
"The games have so much intensity and physicality".
"I haven't really been following the Italian league in the first rounds, I saw a little bit of Napoli, Milan, Inter, and Juventus". "Conte has won (trophies) here and it is hard to take his place".