Sir Tom Jones took to Instagram to deny speculation he had collapsed before a show in Budapest.
The 82-year-old has confirmed the forced postponement was instead due to "viral laryngitis".
While he denied the "pure rumour", he did apologise to fans for cancelling the show at the last minute and confirmed he has already rescheduled the show.
Posting to his 451k fans on the social media platform, the Welsh icon wrote: "Hello to all concerned: I travelled last night from the UK to Budapest and woke this morning with an uncomfortable throat.
"A specialist came to visit and diagnosed 'viral laryngitis'. He strongly advised postponing this evening's show and prescribed medication and vocal rest."
The legendary singer adamantly continued: "I did NOT 'collapse' anywhere at any time, that is pure rumour.
"Hopefully the inflammation will calm soon as I am looking forward to continuing my wonderful summer tour."
He concluded by sending his apologies to fans for any inconvenience and confirmed the rearranged date.
"Unfortunately the show had to be cancelled at the last minute, and for that I am very sorry," he said.
"However, the show in Budapest has been rescheduled and will take place on August 16. Thanks again for all your kind concern. TJ."
Fans were on hand to leave messages of support in the comments section of the statement.
One user wrote: "Hello Sir Tom, I wish you a best and rapid recovery!! Please take care and follow all the medical advices!! get well soon!!""
Another penned: "So sorry to read this. I know how you love to make us happy with your magnificent voice. Stay home rest get better . We will wait."
And a third said: "So glad you have taken doctor's advice. Get well soon wishes sent your way!"
The Sex Bomb singer had been due to perform at the MVM Dome venue but as news broke of the show's cancellation the rumours started to circulate.
He is currently touring Europe with his Surrounded by Time tour.
The night's gig had replaced a previously organised concert in Kyiv which was cancelled due to the ongoing war in Ukraine.
There are several UK legs of the tour, with the singer taking to the stage in locations such as Glasgow, Manchester, London and Birmingham.
He will also perform in countries including Germany, Croatia, Italy, Luxembourg and Belgium in the coming weeks as the tour rattles through 50 dates.
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