Cavani inked terms after a summer of transfer speculation.
De Laurentiis revealed: "I flew to Cardiff during the Olympics with Cavani's agent and our general manager. He was very busy in training and there wasn't even a room in his hotel available for us to stay in. We'd hold negotiations in fits and starts, in-between Cavani's training sessions with Uruguay.
"At the end of the day we finalised the terms in my Rome office and then signed the contract at the Castelvolturno training ground."