Damiano David, the singer for Italy's Eurovision winning rockers Måneskin, has tested negative for drugs, the contest's organisers have said.
It comes following speculation that he snorted cocaine at the final on Saturday.
The Geneva-based EBU said that following allegations of drug use backstage, it had reviewed the facts, including checking all available footage.
It said David voluntarily underwent a drugs test today "which has returned a negative result seen by the EBU".
"No drug use took place in the Green Room and we consider the matter closed.
"We are alarmed that inaccurate speculation leading to fake news has overshadowed the spirit and the outcome of the event and unfairly affected the band."
Favourites Måneskin fought off stiff competition from France and Switzerland, surging to victory on Saturday on the back of the public vote to win with 524 points with their song "Zitti e Buoni".
"We wish to congratulate Måneskin once again and wish them huge success," the EBU said.
"We look forward to working with our Italian member Rai on producing a spectacular Eurovision Song Contest in Italy next year."
Such was the furore that even the French government weighed in, seeing grounds for disqualification if David had tested positive.
France's Europe minister Clement Beaune had called for "total transparency".
"I think there needs to be no doubt here," he told RMC radio.
"If there is a problem, there are penalties... Provisions are made for sanctioning measures, including potential disqualification in case of problems," he said.
French hopes had been riding high on singer Barbara Pravi, who was a bookmakers' favourite to end France's 44-year Eurovision drought with her moody ballad "Voila".
But she was edged out at the last minute by a surge in public votes for Måneskin.
"I don't want to be a sore loser," Beaune said, but "in terms of image, we can't let people think that such competitions can result in such behaviour".
The president of France's public broadcasting group, however, said today that France would not contest its second-place finish, no matter the speculation.
David was asked about the footage during a press conference early yesterday, and said he had been looking down because guitarist Thomas Raggi had broken a glass.
"I don't use drugs. Please, guys. Don't say that really, no cocaine. Please, don't say that," said David, who sprayed his band mates with champagne during the conference.
The four-piece, which also features Victoria De Angelis on bass and Ethan Torchio on drums, told fans on Twitter: "We still can't believe what's going on, these last few days have been incredible and this is just the beginning.
"Our new album 'Teatro D'Ira' has just gone platinum, and so has 'Le Parole Lontane'. This is all thanks to you."
"We can't wait to go on tour all around the world and share our music with all of you."
Italy is one of Eurovision's "Big Five" along with Britain, France, Germany and Spain, who automatically qualify for the finals each year.
