RUSTON - Louisiana Tech head coach Jack Bicknell was visibly frustrated following Wednesday night`s workouts after watching two of his touted freshmen running backs sit on the sidelines due to injuries. First year tailbacks William Griffin and Myke Compton both missed the majority of the two-hour session due to injury leaving only sophomore Patrick Jackson, freshman Daniel Porter and walk-on Ja`Mal Titus to carry the load in the Bulldog backfield. "It`s tough," Bicknell said. "Here I`ve been extremely excited about seeing what these guys can do, and now they are hurt. It`s critical for them to get reps out here so they can learn what they are doing and we can evaluate them." Compton didn`t dress for Wednesday night`s session but said he expects to be back in a few days while Griffin went down early during the night`s workout and didn`t return. Griffin`s undisclosed injury could sideline him for at least a few weeks. "I got to see plenty of Daniel Porter," Bicknell quipped. "I thought he did a good job but we need to get these other guys healthy." Bicknell had already moved Tech`s two leading rushers from last year to other positions as Mark Dillard is practicing at safety while Freddie Franklin is at wide receiver. "I know I can move Freddie back and he could be ready to play (running back) in just a few days," Bicknell said. "However, we want to get him work at receiver." Tech is scheduled to resume workouts Thursday night at 6:45 p.m.