A knee injury has forced Thiago Alves to withdraw from his rematch with fellow welterweight contender Jon Fitch at UFC 107 on December 12, according to Fanhouse. Reports indicate Alves should be able to return early next year and the rematch is likely to be postponed to UFC 108 in January or UFC 109 in February.

After an injury forced Ricardo Almeida to withdraw from their scheduled UFC 106 fight, Jon Fitch is now expected to rematch Thiago Alves at UFC 107 on December 19 in Memphis, Tennessee, according to MMAjunkie, which reports that the welterweight matchup is in the works, while Alves’ original UFC 107 opponent, Paulo Thiago, will be booked for another bout.

In their first meeting at UFC Fight Night 5 in mid-2006, Fitch earned a second-round technical knockout of Alves.

On Tuesday, the UFC officially announced a pair of December cards, as the promotion heads to Las Vegas on December 5 for The Ultimate Fighter 10 Finale before holding UFC 107 on December 12 in Memphis, Tennessee.

Previously-reported fights between Matt Hamill and Jon Jones as well as Frankie Edgar and Kurt Pellegrino were confirmed for The Ultimate Fighter 10 Finale, while BJ Penn vs. Diego Sanchez, Frank Mir vs. Cheick Kongo, and Thiago Alves vs. Paulo Thiago were announced for UFC 107.

Welterweights Thiago Alves and Paulo Thiago are likely to square off at UFC 107 on December 12 in Memphis, Tennessee, according to MMAjunkie.

Both Alves (16-5) and Thiago (11-1) suffered unanimous decision losses in their most-recent bouts last month at UFC 100, with Alves dropping a decision to welterweight champ Georges St-Pierre, while Thiago was topped by Jon Fitch.

13 fighters from the 11-bout UFC 100 card, which took place last Saturday and the Mandalay Events Center in Las Vegas, were tested by the Nevada State Athletic Commission for steroids and drugs of abuse and all of the tests were negative according to NSAC executive director Keith Kizer, who confirmed the results to MMAFrenzy.com on Friday.

The UFC 100 fighters which were tested were Frank Mir, Brock Lesnar, Georges St-Pierre, Thiago Alves, Shannon Gugerty, Jon Fitch, Dan Henderson, Yoshihiro Akiyama, Mark Coleman, Tom Lawlor, Jon Jones, Dong Hyun Kim, and Dan Miller.

Frank Mir, Georges St-Pierre, Thiago Alves, and Michael Bisping were among the 13 fighters issued medical suspensions by the Nevada State Athletic Commission on Monday following their bouts on Saturday at UFC 100.

Mir, who suffered a second-round knockout to Brock Lesnar in the UFC 100 main event, must sit out until September 10 following the loss, while St-Pierre, who defeated Alves by unanimous decision in the co-headliner, could be suspended until January 8 due to a groin injury sustained in the victory.

UFC heavyweight champion Brock Lesnar and welterweight title-holder Georges St-Pierre were the top earners at Saturday’s UFC 100 event, each taking home $400,000 for their co-main event victories.

Dan Henderson ($250,000), Michael Bisping ($150,000), and Mark Coleman ($100,000) were also among the top salaries for the historic card, which drew widespread mainstream media coverage and could surpass 1.5 million PPV buys.

Heavyweight title-holder Brock Lesnar became the UFC’s undisputed heavyweight champion on Saturday in the main event of UFC 100 by avenging the only loss of his MMA career with a second-round knockout of interim champ Frank Mir to cap off the historic pay-per-view event, which took place at the Mandalay Bay Events Center in Las Vegas.

UFC welterweight champion Georges St-Pierre retained his title with a unanimous decision over Thiago Alves and Dan Henderson scored a second-round knockout of Michael Bisping in UFC 100’s other top bouts.

Win or lose in his UFC 100 main event bout against interim title-holder Frank Mir, UFC heavyweight champion Brock Lesnar is guaranteed to be one of the top earners at the pay-per-view event, receiving $400,000 to show for the headlining heavyweight unification rematch.

Mir would make $90,000 ($45,000 to show, $45,000 to win) should he defeat Lesnar for the second-straight time, while UFC welterweight champ Georges St-Pierre could tie Lesnar atop the event’s official payroll with a win over challenger Thiago Alves, as he’s slated to make $200,000 to show and an additional $200,000 to win the co-headliner.

All 22 fighters scheduled to compete tomorrow at UFC 100 successfully made weight on Friday at the event’s official weigh-ins, which were held at the Mandalay Bay Events Center in Las Vegas, the same venue which hosts Saturday’s pay-per-view event.

UFC heavyweight champion Brock Lesnar weighed-in exactly at the 265-pound heavyweight limit, while interim title-holder Frank Mir came in 20-pounds lighter at 245. UFC welterweight champion Georges St-Pierre (170) and challenger Thiago Alves (170) as well as TUF 9 coaches Dan Henderson (185) and Michael Bisping (186) also made weight without issue.

Those concerned that Thiago Alves could miss weight for his UFC 100 co-headliner against welterweight champ Georges St-Pierre will be relieved to learn that Alves’ weight cut for the bout is ahead of schedule.

“Usually I get here (at) 188, 189, and I’m amazed with myself. 183, I’m like whoa. Everybody from the UFC was like, wow, I can’t believe it,” Alves told MMA Weekly.

According to the Nevada State Athletic Commission’s official calendar, UFC 105 is likely to take place on November 21 at the Mandalay Bay Events Center in Las Vegas.

Fanhouse’s Mike Chiappetta speculates that the pay-per-view event could be headlined by the winner of one of UFC 100’s two title bouts between heavyweights Brock Lesnar and Frank Mir and welterweights Georges St-Pierre or Vitor Belfort’s UFC return against middleweight title-holder Anderson Silva.

Welterweight challenger Thiago Alves, who meets UFC welterweight champion Georges St-Pierre on July 11th at UFC 100, has predicted he'll shock the world with a knockout of GSP. "I'm not just going to win, I'm going to knock him out. I'm going to shock the world."

For the UFC’s historic UFC 100 event on Saturday, July 11th in Las Vegas a stacked card featuring the best of the best in mixed martial arts is not only expected, but required. On Wednesday, Brock Lesnar vs. Frank Mir, Georges St-Pierre vs. Thiago Alves, and Dan Henderson vs. Michael Bisping were confirmed for the event.