Updated 9:43 a.m. ET
MANCHESTER, Tenn. Mumford & Sons has canceled its headlining performance at Bonnaroo Music & Arts Festival in Tennessee.
The decision comes after bassist Ted Dwane received treatment this week for a blood clot on his brain.
The band made the announcement on its Facebook page.
The band postponed three shows earlier this week after the blood clot was discovered, but hoped to play Bonnaroo on Saturday night.
Jack Johnson has stepped in to replace Mumford & Sons. He said in a statement: "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."
Dwane is recovering from the surgery and was not ready to play Saturday.
Rather than perform with a replacement, the London-based Grammy-award-winning folk rock band decided to pull out.