Grammy-winning musician John Mayer is in hospital after undergoing an emergency appendectomy, according to his representative.

The Your Body Is A Wonderland singer was due to perform at a concert with the Dead & Company in New Orleans on Tuesday but was postponed.

“Early this morning, John Mayer was admitted to the hospital for [an] emergency appendectomy forcing the Dead & Company Dec 5th concert in New Orleans to be postponed,” the band said in a statement.

“All tickets for the Dec 5 show will be honoured for the rescheduled date. Information on the rescheduled date will be announced as soon as possible. Should ticket holders choose to seek a refund, they will be available at point of purchase.”

Bob Weir tweeted a photo with his bandmate, captioning it, “Wishing a speedy recovery for John. Get well soon my friend.”

Fellow bandmates Oteil Burbridge tweeted his well wishes, “John, get well soon brother!” while Bill Kreutzmann added, “Wishing you well John!”

Wishing a speedy recovery for John… Get well soon my friend. pic.twitter.com/FGYHC8hdCS

— Bobby Weir (@BobWeir) December 5, 2017

Mayer, 40, had performed with the Dead & Company as recently as Sunday.