USC will scrimmage Saturday for the first time in training camp. All four quarterbacks will get even reps, according to Clay Helton.
Helton said he would he would through at least Aug. 17 before eliminating quarterbacks from the alleged race.
Helton spoke glowingly about the offensive line and secondary, two perceived areas of weakness.
After its first day in full pads Wednesday, USC returned to shorts on Thursday.
The injury list included tight end Kyle Ford, wide receiver John Jackson, tight end Ethan Rae, defensive tackle Brandon Pili, cornerback Max Williams, defensive tackle Jacob Lichtenstein, tailback Vavae Malepeai, cornerback Isaac Taylor-Stuart, linebacker Jordan Iosefa and linebacker Solomon Tuliaupupu.