The expert, appointed by a Genoa court as part of a prosecutor's probe, determined that at least 20 of the 21 paintings displayed during the 2017 Ducal Palace exhibit were clearly forged, Italian news agency ANSA reported.
The palace shuttered the show in July, three days before the scheduled end of its four-month run, after prosecutors began investigating the doubts art experts had expressed over the authenticity of the paintings being attributed to Modigliani.
The palace, which had outsourced the show to private organizers, is itself seeking damages for the embarrassment caused by the episode.
Consumer advocate Furio Truzzi urged exhibition-goers Wednesday to seek refunds based on fraud. His organization set up a hotline for people who bought tickets or traveled to Genoa to see the show.
Noted Italian art collector Carlo Pepi, who was among the critics who questioned the provenance of the works displayed in Genoa, described the paintings as "garbage" in an interview on Italian state TV's RaiNews24.
Modigliani, the early 20th century artist whose style as a painter and sculptor was distinguished by elongated necks and faces, died in poverty in Paris in 1920.
Modigliani fakes have caused embarrassment before in his native country. Three marble heads fished out of a canal in Leghorn during the 1980s were initially hailed as long-lost Modigliani masterpieces.
Instead, it turned out a trio of local students crafted the sculptures as a prank in 1984.
In closing down the exhibit in July, the Ducal Palace noted that it had outsourced the organization of the show, including the selection of the works to be displayed. The palace said it would "seek legal protection for its rights and public image."
The owners of the paintings put on display in Genoa were likely to seek a counter-opinion from other experts, since actual works by Modigliani would be worth millions of dollars.
The court-appointed expert, Isabella Quattrocchi, didn't immediately respond to a request for comment. Italian news reports said she concluded that, among other details, the pigment on the exhibited paintings wasn't consistent with the kind Modigliani used.
Milan daily newspaper Corriere della Sera quoted one of the exhibit's two curators Wednesday defending his work and saying that he wasn't the authenticator of the selected paintings.
"I gathered the information and the documentation that was supplied to me for every canvas," curator Rudy Chiappini said. "If there have been irregularities, you need to go back to the source, to whoever made the first attribution" that Modigliani created the paintings.
"I, until proof to the contrary, remain of the idea that the artworks are good" ones, the newspaper quoted Chiappini as saying.
On the eve of the show's March opening, Chiappini told The Associated Press: "Setting up an exhibition of Amedeo Modigliani is always a new adventure."
"I believe that although he painted less than 300 paintings in his life, it's always worth going through his career, starting from a new painting," he added.
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