Already battling an injured knee, Queens Of The Stone Age frontman Josh Homme collapsed after a Monday show in Hamburg, forcing the cancellation of the next evening's concert in Stuttgart.

Already battling an injured knee, Queens Of The Stone Age frontman Josh Homme collapsed after a Monday show in Hamburg, forcing the cancellation of the next evening's concert in Stuttgart. According to QOTSA's Web site, Homme "was diagnosed with exhaustion and ordered to bed by a local doctor."

The statement adds that Homme "has been performing every night on this tour despite his physical condition (due to a knee operation less than a week before he left for tour), and it finally caught up with him. He is resting now and in a stable condition."

The remaining dates on the group's European tour are scheduled to resume tomorrow (Sept. 3) at Spain's Azkena Rock Festival. Homme is also expected to be healthy enough to begin QOTSA's North American tour with Nine Inch Nails, which begins Sept. 16 in San Diego.

It's been a rough few months for the California-based rock act, which have found Homme battling the aforementioned knee injury as well as a lung infection that required the cancellation of a February European tour.

But QOTSA fans do have a lot to look forward to. An Aug. 23 show at London's Brixton Academy was taped for an as-yet-untitled CD/DVD due Nov. 22 via Interscope, and the group has also recorded a cover of Joe Walsh's "In the City" for the soundtrack to the upcoming video game "The Warriors." In addition, Homme has remixed two songs from Death From Above 1979, which will join QOTSA and NIN on the road this fall.