And the winner gets a title shot against reigning division champion Anderson Silva later this year.
That's according to Ultimate Fighting Championship (UFC) President Dana White, who today (Jan. 17, 2012) made the announcement via his official Twitter account.
Munoz is injured and out of the FOX fight! Now it's Chael Sonnen vs Mike Bisping jan 28th and the winner will fight Anderson for the title.
That leaves Bisping's original opponent and fellow middleweight contender Demian Maia without a date to the big dance; however, it does help filter the murky water that is currently the UFC middleweight title chase.
The extent of Munoz's injury or possible timetable for his return has yet to be revealed.
Bisping (22-3) is on a four-fight winning streak within the division, including a recent beatdown of fellow Ultimate Fighter (TUF) 14 coach Jason Miller just last month.
"The Count" is widely-considered one of the top contenders at 185-pounds. Aside from his impressive record, he's one of the few middleweights left on the roster who hasn't already been disposed of by Silva.
That includes Sonnen (26-11-1), who was submitted by "The Spider" at UFC 117 back in August 2010.
Still, the ex-Realtor does have a legitimate claim to a rematch based on the four-and-a-half round ass-whooping he fed the Brazilian prior to getting stuck inside a triangle choke.
Can he defeat the British banger and reclaim what he believes is rightfully his?
UFC on FOX 2 will be headlined by a light heavyweight contendership fight between Rashad Evans and Phil Davis and is currently slated for Jan. 28, 2012, at the United Center in Chicago, Illinois.
More on this upcoming fight card by clicking here.