The You Raise Me Up star was due to perform at the Saenger Theatre on Wednesday night (21Oct15) but he informed fans on Twitter.com that he was postponing the show to Thursday (22Oct15) due to ill health.

"I'm so sorry but I woke up yesterday sick. Was hoping it would be a 24 hour bug but can't shake it by tonight," Groban wrote. "This has been going around and usually lasting 48 hours. So the concert is rescheduled for tomorrow. Sorry for the inconvenience!"

He later announced the rescheduled concert had also been scrapped because his condition had not improved.

He added, "Ok quick unfortunate update. Guys I've been resting hard. On all kinds of meds (sic). And this virus just won't shake. And it's become respiratory... When your instrument is inside your body, sometimes shaking the wrong hand is all it takes to knock you on your a** for a minute... So New Orleans, tomorrow just isn't gonna be possible for reasons out of my control & because of the standard I have of myself for you."

Groban is next due to perform on Friday (23Oct15) in Austin, Texas.