"Chelsea are interested in Cavani and they will call me soon," De Laurentiis told Napoli's official radio station Radio Marte from Los Angeles On Friday.
"I'm very happy that his brother has said that he will stay, but if he did decide to go to Chelsea we would take time out to think and replace him with people worthy of replacing him."
He is also Napoli's third highest goal-scorer with 104 goals in three seasons, 11 behind Diego Maradona, who scored 115 in seven seasons.
"I contacted Unicredit [Italian bank which part-owns Roma] directly for Lamela and Marquinhos. I offered them 40 million," he said.
"They wanted to sell me the services of [Pablo] Osvaldo at all costs, but, seeing that for now we have Edinson Cavani we don't need him.
"This all happened before Benitez signed and I thought I'd done good business for two young players. Then however I began to wonder if they were really worth that amount of money."
