Dave Grohl has been ordered to skip two Colorado performances this week by his doctor. As a result, the Foo Fighters' shows tonight and tomorrow night (July 14 and 15) at Morrison's Red Rocks Amphitheatre have been rescheduled for September 8 and 9.

"As much as it kills us to postpone shows, I'm in no shape to deliver the kind of balls-out performances that you guys deserve," Grohl said in a statement Sunday. "We're already looking forward to September when we can make it up to everyone ten times over. It's gonna be great."

While details of Grohl's medical situation are unclear, fans seeking refunds for the postponed gigs can obtain them at the original point of purchase until the new respective dates. The Foo Fighters' trek will resume Thursday night, July 17, in Oklahoma City.