Napoli have threatened legal action against Sao Paulo after the Brazilian club's president suggested they could use mafia funding to try to buy star midfielder Ganso.
The Serie A giants have been linked with a possible summer swoop for the 24-year-old, but Sao Paulo chief Carlos Miguel Aidar claimed "not even all the Camorra money" could convince him to part with their prized asset.
Napoli have since released a statement expressing their outrage at being linked with the Campanian crime syndicate and have suggested they could launch a lawsuit over the comments.
"Concerning the statements made by the Sao Paulo chairman that offended the image and the history of a glorious and prestigious company such as SSC Napoli, the only thing we can say is that we are each qualified by what we do and say," the statement on their official website read.
"The said statement does not deserve any more attention than we've already given with this release. Beyond what's been already said, of course, there has never been any sort of negotiations for Ganso.
"In any case, Mr. Carlos Miguel Aidar's offensive and fanatic statements are already being considered by our legal department and we will try to protect the club's image, in any court, from being seriously damaged by the Sao Paulo's president's words."
Napoli were similarly incensed earlier this month when British newspaper The Guardian implied the club have connections to the mafia when discussing a round-up of transfer rumours, with the club's director of communications Nicolas Lombardo branding the claim "dated, dumb and vulgar".