USC's defensive line was short-handed this spring.
Leonard Williams made himself available for the NFL draft and Antwaun Woods, Greg Townsend Jr., and Kenny Bigelow were sidelined or slowed because of injuries.
Defensive tackle Claude Pelon was sidelined Saturday after he suffered a shoulder injury, and he was absent Tuesday because of academics, Coach Steve Sarkisian said.
Pelon returned Thursday and said that his shoulder "felt great" and that school was "going great."
The fifth-year senior said the line has made progress.
"We come out here and work as a group, regardless if you are hurt or not, we still work," he said.