Veteran rocker Ozzy Osbourne was forced to postpone a concert in Portland, Maine on Thursday night because he was suffering from the flu.

The singer has since rescheduled his show at the Cumberland County Civic Center for January 31 and has assured fans their tickets from the original gig will still be valid.

Osbourne, who is touring with Rob Zombie, is expected to be well enough to perform at the Verizon Center in Washington, D.C. on Saturday.

(This news article provided by World Entertainment News Network)