Grammy award-winning folk band Mumford & Sons has cancelled a string of shows after bass player Ted Dwane was rushed to hospital.
Dwane, 28, who had been complaining about illness for some time, was to undergo emergency surgery after doctor's discovered as blood clot on his brain.
His health scare comes while he was on tour with bandmates Marcus Mumford, Winston Marshall and Ben Lovett to promote their album, Babel.
"Our friend and bandmate Ted has been feeling unwell for a few days and was taken to a hospital to receive emergency treatment," the band said on their website.
"Scans revealed a blood clot on the surface of his brain that requires an operation. Ted is receiving excellent care and we are being assured that he will recover quickly from surgery."
The band added they had no plans to cancel or postpone any other appearances on the tour apart from Dallas and New Orleans while Dwane undergoes surgery.
The tour is expected to resume at Bonnaroo in Tennessee on 15 June.
They are also scheduled to headline Glastonbury on 30 June.