UT quarterback David Ash reportedly injured his hamstring during workouts.
This injury comes roughly a week before the Horns report to camp.
Although Mack Brown hasn't tipped his hand, most consider the sophomore out of Belton the projected starter over Case McCoy.
A UT spokesman told FOX 7 the severity of Ash's injury is uncertain, but Ash was not able to put weight on that injured hamstring Friday.
Horns report to camp a week from Sunday.