Mumford & Sons fans looking forward to the band’ next few appearances are out of luck. The band has cancelled a number of dates because bassist Ted Dwane is recovering from an emergency surgery to remove a blood clot in his brain. Mumford & Sons had to cancel its appearance on Bonnaroo’s main stage tomorrow. They also had to cancel their appearances at the Telluride Bluegrass Festival and Kansas’ Cricket Wireless Amphitheater. The band posted the following statement on their Facebook page:

Dear friends,

It is with great joy that we can announce that Ted has been discharged from [the] hospital and is on the road to a full recovery. The surgery went well, and the excellent medical team helping him [is] very pleased with his progress. He has been nothing short of heroic in how he has handled the whole ordeal, and now, it has been medically proved that he does indeed have a brain.

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. If we could’ve, we would’ve—you know that about us.We trust that you can respect our collective desire to encourage Ted to make a full recovery and that this is based purely on the medical advice we have received.

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

Ted, Ben, Marcus and Win

Mumford & Sons still have some more summer dates planned, including performances at the U.K.’s Glastonbury on June 30 and at Lollapalooza in Chicago on Aug. 3. Jack Johnson will take the band’s spot at Bonnaroo tomorrow night.