Madonna's performance at the Eurovision Song Contest has been thrown into doubt by organisers, who say she has yet to sign a contract for the show.
Speaking on Monday, Eurovision's executive supervisor Jon Ola Sand said: "The European Broadcasting Union has never confirmed Madonna as an act."
He continued: "If we do not have a signed contract she cannot perform on our stage.
Eurovision organisers downplayed the story at the time, saying "no final decisions" had been made - although this appeared to be a formality.
But Sand, who has produced the contest since 2010, said on Monday that negotiations were still underway.
"We are in a situation now that is a bit strange," he said.