Måneskin's Damiano David rejected the idea that he had been taking cocaine.
"I don't use drugs. Please, guys. Don't say that really, no cocaine," he said at a press conference.
In a statement, Eurovision said the singer would "take a voluntary drug test after arriving home".
Måneskin, who had been favourites to win the contest, took the top prize with their song Zitti e buoni.
People at home speculated as to what the singer was doing when he appeared to bend his face towards a table as the band celebrated their victory during the live broadcast.
Source:
BBC