The annual rigors of training camp are starting to show at USC.
Last week, defensive lineman Antwaun Woods suffered an elbow injury that could sideline him for a few weeks.
Sunday's morning practice, which came after an off day, also took its toll.
"We got a little nicked up," Sarkisian said.
Linebacker Jabari Ruffin intercepted a pass by quarterback Max Browne, but suffered an apparent knee injury when he was tackled during the return. Ruffin was helped to the sideline by trainers and spent the rest of practice with an ice pack on his knee.
Receiver Darreus Rogers rested a sore Achilles' tendon and multipurpose back Adoree' Jackson sat out much of practice after a player stepped on his foot, Sarkisian said. Defensive lineman Leonard Williams was held out after taking a hit to his left shoulder. Williams is recovering from right shoulder surgery.