Trezeguet's agent Antonio Caliendo revealed that while talks with the Italian outfit were still ongoing the prospect of a deal remains distant.
"Both parties have to want a marriage," Caliendo told Radio CRC.
"There is nothing new to report at the moment with regard to the negotiations and that doesn't leave me very optimistic.
"Napoli would certainly be Trezeguet's preferred choice because they have the environment which would allow the player to test himself at the top level.
"Two Brazilian clubs have made valid offers for him, but we didn't consider them as we had other objectives."
The 33 year-old French striker is keen to leave Hercules after the La Liga side were relegated last season.
Napoli are in the midst of preparing a squad for UEFA Champions League football next season.