That's because his light heavyweight opponent, James Irvin, has tested positive for Epitrenbolone, a steroid typically used on livestock to increase appetite and muscle growth, according to a statement released today.
"The Sandman" returned a positive sample of a Dec. 2 test on March 2 under the California State Athletic Commission (CSAC) and a retroactive one-year suspension was immediately applied.
He will reportedly appeal said suspension.
Since getting the boot from the world's largest fight promotion, Irvin is 1-1-1, having last competed at "Young Guns 4" under the Gladiator Challenge banner, drawing a No Contest (NC) for an illegal knee to the head of opponent Mike Crisman.
Irvin's positive test stems from a December 2 loss to Jorge Oliveira at Tachi Palace Fights 7: "Deck the Halls" in Lemoore, California.
Shark Fights representatives have yet to issue a statement regarding his upcoming fight in Lubbock.
Stay tuned to MMAmania.com for more information on this story as it develops.