Glastonbury co-organiser Emily Eavis admitted she was worried about Mumford and Sons bassist Ted Dwane when he had to have brain surgery - and thought the band would have to cancel.
The folk group's headlining slot on Sunday night (30.06.13) was thrown into doubt when Ted was rushed to hospital on June 10 to have a blood clot removed, but he has since made an excellent recovery - and the band have confirmed they will perform at the world renowned music event.
Emily - who plans the festival with her dad Michael Eavis - told The Sun newspaper: ''We were concerned like everyone else when we heard about Ted's operation but they very quickly assured us the show would go on. I think he will get a hero's welcome when he steps on the Pyramid Stage.''
Mumford & Sons - which also includes singer Marcus Mumford, drummer Ben Lovett and banjo player Winston Marshall - first played Glastonbury in 2008 and have appeared at the festival every year since.
The event, which is held at Worthy Farm in Pilton, Somerset, South West England, has been running since 1970, and has attracted some of the biggest stars in music history.
This year's other headliners are The Rolling Stones, who despite going for 50 years are making their Glastonbury debut on Saturday night (29.06.13), and the Arctic Monkeys who perform this evening (28.06.13).
Michael added: ''There isn't a festival like this in the whole world and this year is going to be one of the best ever.''