The Partenopei supremo has claimed that the Serie A side met the precise figure he was told would be sufficient to secure the signing of the France international.
The France international appeared set to move to the San Paolo this week, with the player having admitted that he was hopeful that the two clubs could come to an agreement over a transfer.
However, Lyon rejected Napoli's bid for the player, much to the disgust of De Laurentiis, who believed he had met the asking price.
"We made an offer to Lyon that corresponded with precisely how much they requested," the Partenopei supremo told l'Equipe. "Aulas sent me a message some time ago which he said he would sell Gonalons and indicated to me the required price to be able to have him."