USC Injury Update: Leonard Williams, Adoree' Jackson Out

The USC Trojans returned from Arizona with a victory, but came home bruised and banged up. That was evident at Tuesday morning's practice as some key players were not fully dressed out.

Most notably missing was the Trojans' All-American defensive lineman Leonard Williams and potential freshman All-American cornerback Adoree' Jackson.

USC head coach Steve Sarkisian said Williams was held out due to his shoulder acting up coming out of the Arizona game. After playing 94 snaps against the Wildcats, according to Sarkisian, Williams definitely deserved the extra day of rest.

Jackson is still trying to recover from groin and hip flexor injuries that forced him to leave the Arizona matchup. His fellow cornerback, Kevon Seymour, who was only able to play part of Saturday's game, did return from his ailments to practice on Tuesday.

With Jackson and Seymour out against Arizona, freshmen Jonathan Lockett and John Plattenburg both stepped in and played well for their first critical playing time. Sarkisian said he plans to keep pushing the young secondary and also added that Plattenburg is now pushing for a spot in the starting lineup.

"We're still evaluating, but he played well enough to warrant consideration," Sarkisian said.

Plattenburg spent the portion of practice I was able to attend working with the first-team defense at safety in place of Leon McQuay III.

Fullback Soma Vainuku missed practice with a hamstring injury. After the game Saturday, Vainuku said he injured his hamstring covering a second-half kickoff, but also said he'd be ready to go against Colorado.

USC's senior kicker, Andre Heidari, dressed out for practice, but did not participate in the kicking drills, according to the OC Register's Michael Lev. Heidari's status is uncertain for Saturday as of now. If he is unable to go again, the duties will once again fall upon the leg of redshirt sophomore walk-on Alex Wood.

Wood was a perfect 4-for-4 on extra points against Arizona. Special teams coach Johnny Nansen said Wood's range could extend out to around 48 yards, if he were needed.

Here's Steve Sarkisian's post-practice media scrum where he talks about the injuries, Plattenburg, wanting to push the ball down the field more, Buck Allen and his plans to continue to push his young secondary: