AUSTIN, TX - JUNE 08: Marcus Mumford performs in concert with Mumford & Sons at the Austin 360 Amphitheater on June 8, 2013 i
Gary Miller/FilmMagic

After bassist Ted Dwane underwent surgery earlier this week after suffering from a blood clot in his brain, Mumford & Sons have cancelled their headlining spot at Bonnaroo.

The "I Will Wait" band was supposed to take the stage Saturday night at 9:30 pm but announced a change of plans Thursday night on their Facebook page... with both good and bad news.

"It is with great joy that we can announce that Ted has been discharged from hospital and is on the road to a full recovery. The surgery went well, and the excellent medical team helping him are very pleased with his progress," they wrote. "Today, however, also marks the end of our Summer Stampede Tour. We were hoping to have made it out by Bonnaroo this weekend. But it is with sadness that we have to announce the cancellation of our scheduled performances at both Bonnaroo and Telluride Festivals, and our show at Cricket Wireless Amphitheater in Bonner Springs, KS."

The band concluded, "On behalf of Ted, and all of us really, we would like to thank every one for their compassion and support at this time and we are very excited to get back out on tour as soon as we can."

Jack Johnson, originally in town to perform with his labelmates ALO, will replace the folk-rock group, confirming the news on his Facebook page:

"I was on my way to Bonnaroo to sit in on a set with my friends ALO last night when we got the call asking if I could possibly help out and cover for Mumford and Sons. I heard the news about Ted Dwane and was happy to know that he was on his way to recovery. I called my band and asked if they were up for it. Long story short - they are headed this way. I've got a lot of lyrics and chords to relearn by Saturday night. I was here to play the first Bonnaroo and it is a very special festival to my band. We are excited to hit the stage again. Get well Ted!"

Odd Future rapper Earl Sweatshirt has also canceled his Bonnaroo appearance due to pneumonia. "To everyone at bonnaroo: im sorry i cant make it im really really f-cking sick but i will make it up to tennessee as soon as i possibly can," he tweeted. And then he also added, "to everyone who think im being overdramatic, go get pneumonia and then try singing 'whoa' all the way through with no hypeman. im just sayin."

Brooklyn indie rock group DIIV will take over Earl's slot after the band's original Thursday slot was canceled due to travel issues. 

A speedy recovery to both Ted Dwane and Earl Sweatshirt. In the meantime, check out the rest of our Bonnaroo coverage.