A welterweight matchup between Paulo Thiago and newcomer Jacob Volkmann, previously scheduled for the non-televised UFC 106 preliminary card, has been shifted to the event’s pay-per-view main card after a bout between Karo Parisyan and Dustin Hazelett was scratched from the card on Thursday.

Karo Parisyan has withdrawn from his UFC 106 welterweight matchup with Dustin Hazelett just two days before Saturday’s pay-per-view event in Las Vegas and will “not be fighting again in the UFC,” UFC President Dana White announced today on Twitter.

“Karo Parisyan has f***** over the UFC, the fans and his opponent again. He will not be fighting Saturday or ever again in the UFC,” wrote White. “Pulled out of the fight the day before weigh-ins again with a laundry list of excuses. Let the press ask Karo why. Let him explain.”

UFC 110, the UFC’s long-rumored February event in Sydney, Australia expected to be headlined by Wanderlei Silva vs, Yoshihiro Akiyama, will take place in the afternoon on Sunday, February 21, but will air live in the United States on pay-per-view on Saturday, February 20, according to MMAjunkie.

The UFC has released the medical suspensions from Saturday’s UFC 105 event in Manchester, England, with headliners Randy Couture and Brandon Vera each receiving 30 day suspensions, while five fighters, including Mike Swick and Matt Brown, could be out up to 180 days for more serious injuries.

The complete list of UFC 105 medical suspensions is after the jump…

On the latest episode of The Ultimate Fighter 10, Team Rashad’s Brendan Schaub and Jon Madsen meet in the second quarterfinals matchup, while Matt Mitrione continues to suffer from concussion-like symptoms and could be forced to drop out of the competition. Continue reading to find out who advanced to the TUF 10 semifinals and what to expect on next week’s episode.

A rematch between UFC light heavyweight champion Lyoto Machida and Mauricio “Shogun” Rua will headline a May 1 UFC event in Montreal, Canada, UFC President Dana White confirmed with Yahoo Sports’ Dan Wetzel on Wednesday.

Machida retained the 205-pound title with a controversial unanimous decision win over Rua in their first meeting at UFC 104 in October.

UFC heavyweight champion Brock Lesnar underwent minor surgery yesterday to treat a bacterial infection in his intestinal tract and has been released from the hospital.

With Lesnar out indefinitely, White told the LA Times on Tuesday that the UFC will schedule an interim heavyweight title fight, with Carwin and fellow contender Cain Velasquez expected to square off early next year.

Light heavyweights Randy Couture and Mark Coleman are expected to meet in the main event of UFC 109 on February 6 in Las Vegas, according to Sherdog, marking the first time UFC Hall of Famers will square off inside the Octagon.

Couture is coming off a win over Brandon Vera this past Saturday at UFC 105, while Coleman defeated Stephan Bonnar in his most-recent bout in July.

A matchup between Renzo Gracie and Matt Hughes, for Gracie’s UFC debut which was previously rumored for UFC 109 and then later reported as possibly postponed will not be taking place. Instead Gracie will face a different, as yet unnamed opponent, at an as yet unnamed time for his promotional debut

The already postponed middleweight title bout between Anderson Silva and Vitor Belfort has a new target date. The matchup is now targeted to headline the February 6 UFC 109 card.

UFC welterweight champ Georges St-Pierre and top contender Dan Hardy are “not under consideration” to be coaches on The Ultimate Fighter 11, according to Heavy.com. Yesterday, The Telegraph reported that St-Pierre and Hardy could appear as coaches on the reality series, likely delaying a matchup between the pair from February or March until mid-2010.

UFC heavyweight champion Brock Lesnar is suffering from a bacterial infection in his intestinal tract, according to the Associated Press. The previously-undiagnosed illness will keep Lesnar out of action indefinitely, though he could be released from the hospital soon, UFC President Dana White told the AP.

UFC heavyweight champion Brock Lesnar, sidelined indefinitely from an undisclosed illness, is likely to require “major surgery” and may never fight again, UFC President Dana White today told TMZ.com.

According to White, Lesnar, who is also suffering from mono, has been hospitalized since collapsing during a trip to Canada last week. He will reportedly be transferred to the Mayo Clinic, where he’d undergo surgery for a “intestinal disorder”.

The UFC will host its first event in Virginia on January 11 as UFC Fight Night 20 takes place at the Patriot Center in Fairfax just outside of Washington, D.C. The Spike TV-televised event is headlined by a lightweight matchup between contenders Gray Maynard and Nate Diaz, while Efrain Escudero takes on Evan Dunham in the evening’s co-main event.

A matchup between light heavyweight contenders Rashad Evans and Thiago Silva will headline UFC 108 on January 2 in Las Vegas, the UFC today announced.

Heavyweight contenders Antonio Rodrigo Nogueira and Cain Velasquez were to meet in the card’s main event, which was announced just last week, but Nogueira was forced to withdraw from the bout due to a severe staph infection in his left elbow.