Madonna may not even be able to perform at the glitzy gathering, as organisers claim diva has yet to sign a contract.
Madonna's participation in the prestigious song contest has remained in doubt until her arrival amid reports of disagreement over her salary and calls by pro-Palestinian groups to boycott the event.
It should be noted that Miller-Heidke's performance in this year's Eurovision has stirred up lots of controversy, following the ongoing call from people for artists to boycott Israel in protest of their occupation of Palestine. "Any official news and updates will come directly from the Eurovision channels in due course", said the organisation's senior communications officer, Dave Goodman.
"We are negotiating but if it's not signed, it won't happen", he said.
"People have spoken on behalf of the EBU, for many months now, without it being authorised", Mr Sand said.More news: Passenger jet in Myanmar lands on rear wheels after landing gear fails
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Jon continued: "We are in a situation now that is a bit odd". We have an artist who would like to participate in the Eurovision Song Contest, and who we would love to welcome on that stage, but for that we need to have the framework secured.
Despite the performance being confirmed by Madonna's United Kingdom and USA publicists in April, Eurovision organisers said "no final decisions" had been made at the time. The singer eventually spent two hours rehearsing her act, which is expected to feature three songs.
The singer released a statement to CNN today where she said that she would not stop performing music "to suit someone's political agenda", but added that she would continue to speak out against human rights violations. "I hope and pray that we will soon break free from this bad cycle of destruction and create a new path towards peace", the statement continued.
Kan played down the hack, noting that the evening ended without further incident as Greece, Belarus, Serbia, Cyprus, Estonia, Czech Republic, Australia, Iceland, San Marino and Slovenia made it through to Saturday's finals. Eurovision tradition holds that the winning nation hosts the following year's event.
Many artists continue to play Israel while condemning the ongoing bloodshed in the Israeli/Palestine conflict, including Nick Cave, who a year ago wrote an open letter calling "the cultural boycott of Israel... cowardly and shameful". Security has been tight in Tel Aviv amid fears that activists may seek to disrupt the competition.