Arik Armstead practiced with Oregon on Tuesday, though when he'll make his debut in a game is unknown.
The freshman, a defensive lineman on the football team, which concluded its season only last Thursday, worked out with the basketball players in the spring and summer and then attended some practices in early December before football bowl workouts began.
"Football conditioning and basketball conditioning are two different things, so it might be a while before he's ready to go," UO coach Dana Altman said.
As far as working into the UO system, Altman said Armstead "picks things up unbelievably. I can see why as a freshman" he was able to contribute to the football team.
"He watches our stuff and he goes out there and he knows it," Altman added.
"He's really a bright kid. I don't have any worry about that."
Listed on the roster at 6-feet-8 and 280 pounds, Armstead averaged 10 points and 10 rebounds as a senior at Pleasant Grove High School in Sacramento before ending his season early so he could enroll a year ago at Oregon and participate in spring football drills.
As a junior, Armstead averaged 16 points and 10 rebounds, and entered his senior season ranked as the No. 3 basketball prospect by NorCal Prep.
Armstead will remain on a football scholarship, still his primary sport. His addition puts 15 players on Oregon's roster.