Daniel O'Donnell was forced to cancel his sold-out show at the Cork Opera House on Saturday night due to illness.
The Donegal singer hopes to reschedule the concert as soon as possible.
In a video message to fans, he said: "Unfortunately, I've had some problems with a chest infection, and I just can't get the voice to work tonight."
"We will let you know in due course as to what to do about tickets or refunds or whatever is best for you," he continued.
"I'm really, really sorry for the inconvenience, but I just cannot sing."
