Armond Armstead has returned to classes at USC but his football conditioning for the Trojans remains on hold.
The former Pleasant Grove High School of Elk Grove All-American was hospitalized earlier this month to undergo tests for an unspecified condition. He was released three days later.
Armstead was in Elk Grove to visit family during USC's spring break and resumed his classes Monday, his father Gus said.
"He's fine, and we're just waiting on some test results to be sure everything is OK," the elder Armstead said.
Armstead started 11 games for USC at defensive end, and he has started games earlier in his career at defensive tackle. He is expected to resume his starting spot this fall and is widely considered a high-round draft pick for the 2012 draft.
Armstead said upon his hospital release, "My family and I want to thank everybody for their thoughts and prayers. I heard from so many people and I really appreciate their support. I feel good, my spirits are up, I'm ready to go back to class."
Also for USC, defensive tackle Christian Tupou of Grant will sit out spring drills this week as he continues to rehabilitate a knee injury that cost him the 2010 season. Tupou was so highly regarded by his teammates, that he was still named a team captain last fall after starting the previous two seasons.