Blues boss agreed not to raid Napoli
Maurizio Sarri signed a contract agreeing not to buy any Napoli players, excluding Jorginho, on his departure from the Serie A club.
Sarri was confirmed as Chelsea's manager earlier this month after two seasons in Naples during which the Italian club came close to ending their 28-year Scudetto draught.
Despite eventually leaving Italy empty-handed, Sarri received recognition for his style of football and managerial approach, drawing notable praise from Pep Guardiola.
Upon his arrival at Chelsea, Sarri moved to bring Jorginho to Stamford Bridge, but nobody else will be heading for Stamford Bridge from Napoli.
"I only let him go once he had signed a contract which stated he would not be allowed to sign any of our players apart from Jorginho," Napoli president Aurelio De Laurentiis revealed.
"There was a huge battle to take more of our players but they didn't manage it."
De Laurentiis has warned Chelsea against Sarri's stubborn nature, revealing that the Italian rarely rotated his Napoli team.
"Yes (he is a genius), but he's also very set in his ways," said the Napoli chief. "He would use the same 11-13 players and it's impossible to compete in two competitions when you do that. A real, bona fide coach has to win things - not just entertain."