The 59-year-old fell just short of earning Napoli a first Serie A title since 1990, finishing behind Juventus with an impressive tally of 91 points, but De Laurentiis has suggested that all was not well behind the scenes.
"Last season was distorted and snatched from us: we belong to what [former Italian actor] Toto called The Band of Honest Men," he said.
"That aside, there were errors in judgement throughout the season, the ability to be able to use the squad fully. Still, I don't want to get into a technical speech or reopen any wounds that have healed."
Chelsea were made to pay Napoli a compensation fee to buy out Sarri's contract, which still had a year left to run.