Junior tailback Justin Davis participated in a full workout for the first time since suffering a hamstring injury on the first day of training camp.
Davis, the Trojans' leading returning rusher, said he was working his way back to 100%.
Senior Tre Madden has looked sharp and freshmen Ronald Jones II, Dominic Davis and Aca'Cedric Ware also fueled Davis' motivation to return.
"That's why they came to 'SC and that's why I came here — the competition," Justin Davis said. "They're always going to keep me on my toes and they've shown it so far."
Sarkisian announced that blue-shirt offensive lineman Clayton Johnston, receiver Deontay Burnett and tight ends Taylor McNamara and Daniel Imatorbhebhe signed scholarship papers.
The scholarships count toward the 2016 class.
Imatorbhebhe, a transfer from Florida, is not eligible this season.
Sophomore cornerback Jonathan Lockett made two outstanding plays in the final drill near the goal line, breaking up one pass and intercepting another…. Cornerback Kevon Seymour, who did not finish practice Saturday because of a knee injury, returned but was limited…. The Trojans practice Monday at 6:45 p.m. and are scheduled to scrimmage for the first time.