Former Trojans defensive tackle Armond Armstead was in attendance at the USC pro day on Wednesday but did not go through any of the on-field drills.
Armstead, who was forced to miss the 2011 season due to an undisclosed medical condition, said he will conduct a private workout for NFL scouts on April 9.
"I wish I could be out there today but the attorneys said I couldn't be on the field," Armstead said. "Guys like Matt (Kalil) and Nick (Perry) are some of my best friends, we went through college together, and I wanted to be with them."
Armstead said he had a second-round draft evaluation following the 2010 season but elected to come back for his senior season at USC.
Because of the medical condition, he was never cleared by USC doctors and he eventually sat out the whole season. Armstead left USC after the fall 2011 semester with thoughts of transferring to another school for the 2012 season. He would have had one year of eligibility remaining and could have played right away since he graduated from USC last December. Those transfer plans didn't materialize, and he has made the decision to move forward with his professional career.
"Of course I was upset," Armstead said about missing the 2011 season. "Not at anyone, just at the situation. I can understand legal and liability issues, but I wanted to be out there helping my team."
Armstead was weighed and measured during the pro day and checked in at 6-foot-5, 285 pounds.