MMAWeekly.com is reporting that Canadian middleweight Jason “Dooms” Day has withdrawn from his scheduled September 6th bout with Jason “The Punisher” Lambert. According to the report, Day suffered an elbow and biceps injury that will require him to undergo a MRI and keep him out of the fight.

Sherdog.com is now reporting that Day’s replacement will be fellow Canadian Jason “The Athlete” MacDonald.

MacDonald, a native of Pictou County, Nova Scotia, possesses a UFC record of 4-3 with victories over Ed Herman, Chris Leben, Rory Singer, and Joe Doerksen. MacDonald’s most recent outing came at UFC 87: Seek and Destroy where he fell victim to the ground game of Demian Maia after three grueling rounds.

Jason Lambert is looking to test his hand at 185 pounds after spending the majority of his career in the light heavyweight division. Lambert has gone 4-3 in the UFC with victories over Renato “Babalu” Sobral, Branden Lee Hinkle, Terry Martin, and Rob MacDonald.

UFC 88: Breakthrough is scheduled for Saturday, September 6, 2008 at the Philips Arena in Atlanta, Georgia. The card will be headlined by a light heavyweight bout featuring former UFC light heavyweight champion Chuck “The Iceman” Liddell and Rashad Evans.