Thiago Alves continues to battle injuries, as the former number one, welterweight contender has been forced to withdraw from his scheduled, UFC on FOX Sports 1 1 bout with Matt Brown on August 17th. Veteran welterweight Mike Pyle will take his place.

The switch was announced by the UFC on FOX Sports Twitter feed, however, the nature of Alves’ injury was not disclosed. “The Pitbull” hasn’t competed since March, 2012, when he lost by submission to Martin Kampmann at UFC on FX 2. Alves was also forced to withdraw from UFC 149 last summer due to injury.

So, Pyle (25-8-1) has been handed a high profile opportunity to extend his winning streak, which currently sits at four. Most recently the former Xtreme Couture fighter scored a split decision win over Rick Story at UFC 160. The last man to defeat the 37 year-old vet is Rory MacDonald, who stopped Pyle in August, 2011.

Brown (17-11) is also rising up the welterweight ranks, thanks to a five consecutive wins and victories over fighters like Mike Swick and Jordan Mein. The 32 year-old Brown hasn’t lost since November, 2011, when he was submitted by Seth Baczynski.

It’s unfortunate Alves has been injured again, as a bout with Brown would have likely produced some serious fireworks, but Pyle will make for an interesting match-up as well.

UFC on FOX Sports 1 1 will be hosted by the TD Garden Arena in Boston, and will be headlined by a light-heavyweight bout between “Shogun” Rua and Chael Sonnen.