The 6-foot-3 265-pound defensive tackle told FOX Sports NEXT on the phone Tuesday evening he thought he did "Pretty well," and that the competition level at the camp was high.
"One of the guys out there, a USC commit, he was really good," Jefferson said, referring to 2014 offensive lineman Toa Lobendahn. "I went against him all day."
Jefferson also got to work with USC defensive line coach Ed Orgeron, "He showed me a lot of different techniques," Jefferson said.
While on the phone, the Florida native was wandering around USC's campus. He said he already took a visit inside the Trojans recruiting centerpiece -- the John McKay Center -- and thought it was "really nice". He did note, however, his difficulty in really being able to get a sense of the USC campus since a large portion of it is under summer construction.
According to Jefferson, the Trojans are offer No. 23 for him. He says none are standing out this early in the process.
As for the USC offer, Jefferson seemed sincerely excited about it, but says it's unlikely he'll choose to go to college on the West Coast, since he's a Florida native. "I'd like to stay closer to home," he said.
Jefferson isn't planning to play football during day two of Rising Stars. He said he wants to spend the day roaming about campus and seeing what else USC is about.