Koscheck vs. Johnson new co-main event at UFC 106

Welterweights AnthonyJohnson and JoshKoscheck will co-headline UFC 106 on Nov. 21 in Las Vegas.

Koscheck confirmed his participation on the fall card earlier via his official Twitter account.

The event's original headliner, Brock Lesnar vs. Shane Carwin, was moved to Jan. 2 at UFC 108 after illness forced Lesnar to withdraw. Light heavyweights Tito Ortiz and Forrest Griffin were subsequently bumped up to main event status.

Mark Coleman had been scheduled to take on Ortiz before catching the injury bug.

Johnson (10-2) is days removed from a devastating knockout of YoshiyukiYoshida at UFC 104, a victory blemished by a five-pound weight overage that cost him 20 percent of his purse and a $65,000 bonus for "Knockout of the Night." Johnson apologized for his misstep after the fight and said he struggled with a knee injury sustained in preparation for a June bout with Matt Brown (the bout was eventually cancelled when both fighters revealed injuries).

Koscheck (17-4) was originally scheduled to take on up-and-comer Mike Pierce on Jan. 11 at UFC Fight Night 20 before the shuffle. In his last Octagon appearance, the original Ultimate Fighter alum spoiled the return of former welterweight contender Frank Trigg at UFC 103. He is 11-4 in the UFC.