The Salvator Mundi was described as "one of fewer than 20 known paintings by Leonardo" when it sold for a record $642 million in 2017, only to disappear without trace amid increasing doubts about its attribution to the Renaissance master.
Months after the Louvre Abu Dhabi suddenly cancelled its unveiling, the picture is now facing an apparent snub from the Louvre in Paris, which is understood to have scrapped plans to display it in its major Leonardo exhibition.
Jacques Franck, who has been a consultant to the Louvre on Leonardo restoration projects, told The Sunday Telegraph that politicians at the highest levels and Louvre staff "know that the Salvator Mundi isn't a Leonardo".
He is among those who believe that it was painted primarily by one of Leonardo's studio assistants, and has written to Emmanuel Macron, the French president, warning him against inaugurating the Louvre's autumn Leonardo exhibition if the Salvator Mundi, a depiction of Christ as the "Saviour of the World", is included. He has told him that it would be "almost scandalous".
He added: "The Louvre is the dominant museum collector of Leonardo in the world. They have the Mona Lisa, Saint Anne, Saint John the Baptist, the authentic version of The Virgin of the Rocks, and plenty of drawings.