Jay Hieron to replace Josh Koscheck
Welterweight contender Josh Koscheck has a bulging disk in his back and will not compete at UFC 151 on Sept. 1.
UFC revealed Koscheck's injury Tuesday night during its "Insider" program on Fuel TV.
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Koscheck was scheduled to face Jake Ellenberger in the UFC 151 co-main event.
UFC announced Wednesday that Ellenberger will now face veteran Jay Hieron on the card.
Ellenberger (27-6) looks to rebound from a second-round knockout loss on June 1 to Martin Kampmann. The setback snapped Ellenberger's six-fight win streak.
Hieron returns to UFC for the first time since October 2005. And he is no stranger to Ellenberger.
"It's awesome. I feel great. It's been a long time coming," Hieron told ESPN.com. "It's the perfect time for me to get back in.
"We actually fought back in June 2006 and I won (by unanimous decision). I beat him before and I believe I can beat him again.
"I've cornered guys who've fought him. My teammate Mike Pyle fought him, but Jake beat him. And recently Martin Kampmann fought him and I cornered (Kampmann) and Martin beat him."
Hieron improved to 23-5 on July 13 with a second-round submission of Romario da Silva at Legacy Fighting Championship 12 in Houston.
It will be Jones' fourth title defense.