The four-star prospect has picked up a flurry of offers over the spring and was hoping USC would be his latest, but he left Troy without one.
"I'm happy with how things went today," Plattenburg told FOX Sports NEXT on the telephone. "I worked hard. I wish I would've gotten an offer, but sometimes it's about being patient and working."
The 5-foot-11 187-pound corner said he went against Jordan Lasley most of the day at Rising Stars, noting he was beat only once when trying to decide if he wanted to press or play off the ball. "He's really good," Plattenburg said, "but he only got me that one time."
Plattenburg says offensive line assistant and Centennial recruiter James Cregg told him they didn't have enough film of him to evaluate in order to make an offer, something that left Plattenburg puzzled, noting that he has film from his Junior season, Centennial's coaches showcase, and now Rising Stars. "I don't know what else I can do," he said.
Originally from Texas, Plattenburg said a USC offer would mean a lot to him. "USC used to be my school," he said. "My mom went there and since moving from Texas, that was my main objective, to get an offer from USC.
"There's still a chance," he continued. "I'm just going to have to go out this season and do my best."