American rockers My Morning Jacket have been forced to cancel a prestigious New Year's Eve gig and their European tour after frontman Jim James fell ill.

A statement on the band's official website says James has been struck down by "health complications related to pneumonia", forcing them to scrap a 31 December (05) concert at legendary New York City venue Madison Square Garden supporting The Black Crowes.

My Morning Jacket's European gigs, which were scheduled to start in January (06), have also been called off.

The band have vowed that fans will not miss out as they plan to rearrange dates when James is back in action.