Oregon running back De'Anthony Thomas injured his leg while returning the opening kickoff against Cal on Saturday.
Thomas left the game after appearing to grab his right leg after the return. He was helped off the field, and he returned to the sidelines in the second half on crutches.
Thomas leads the Ducks
this season with 338 rushing yards and six touchdowns, and he's combined for 485 all-purpose yards through Oregon's first three games.