Just over a week away, the UFC on FOX 2 co-main event has officially changed as Michael Bisping will replace Mark Munoz in his bout against Chael Sonnen as Munoz suffered an injury during training. The middleweight contest will determine the #1 contender to Anderson Silva and the 185 pound title. Demain Maia, who was originally scheduled to fight Bisping on the same card.

Dana White tweeted the news earlier today.

UPDATE: It has since been confirmed unbeaten grappler Chris Weidman will step up and fill in for Bisping against Maia.

Bisping will be looking to add to his four-fight win streak, which includes victories over Dan Miller, Yoshihiro Akiyama, Jorge Rivera, and Jason Miller. The British middleweight is 8-2 at 185, with his only two losses coming against MMA legends Wanderlei Silva and Dan Henderson.

Sonnen returned from a year long suspension due to a failed drug test following his UFC 117 bout for the middleweight strap this past October and made things look easy against Brian Stann, submitting him in the second round with an arm triangle. The Oregon native has won four of his last five bouts.

UFC on FOX 2 is scheduled for January 28 at the United Center in Chicago, Illinois. The night will be headlined by another #1 contenders bout as former light heavyweight champion Rashad Evans will face the undefeated Phil Davis, with the winner earning a shot against current 205 king Jon Jones.