Lightweight Kyle Bradley recently sustained an undisclosed injury while training, forcing him out of his upcoming bout against Sam Stout at UFC Fight Night 19: "Diaz vs. Guillard" from the Cox Convention Center in Oklahoma City, Okla., on Wednesday, Sept. 16.

No replacement to take on "Hands of Stone" is known at this time.

Bradley was out to prove that his first round technical knockout win over Phillipe Nover at UFC 98: "Evans vs. Machida" back in May, which took less than 65 seconds, was no fluke.

That's because the 155-pound bout was mired in controversy when it appeared that Nover -- The Ultimate Fighter (TUF) 8 lightweight finalist -- was in trouble after a big slam and subsequent flurry from Bradley. However, replays showed that Nover appeared to be maneuvering for a submission when the referee in charge of the action, Yves Lavigne, stepped in to stop the action.

Regardless, the result stood and Bradley registered his first win inside the Octagon in three attempts. He'll now have to wait a little while longer to make it two out of four.

UFC Fight Night 19: "Diaz vs. Guillard" will feature a main event between hungry lightweight up-and-comers and former TUF grads Nate Diaz and Melvin "The Young Assassin" Guillard.

In addition, Roger "El Matador" Huerta will throwdown for perhaps the last time inside the Octagon as he tries to leave on a high note against the stifling super-wrestler Gray "The Bully" Maynard.

To check out the latest UFC Fight Night 19 fight card click here.