USC coach Lane Kiffin needed one week of practice to reduce the Trojans' quarterback competition from three to two.
Third-year sophomores Max Wittek and Cody Kessler remain in the derby, with freshman Max Browne lacking the ability to handle "the speed of the game" as well as the others at this point in his development, Kiffin said.
Browne's third-string status does not necessarily mean that he'll redshirt, Kiffin said. Browne, a highly regarded recruit from the Seattle area, led his high school team to a 57-25 win over Cottonwood in a nationally televised game in Salt Lake City last September.
Wittek, meanwhile, has an edge in experience over Kessler. He replaced an injured Matt Barkley and finished USC's game against UCLA last November, then lost to Notre Dame and Georgia Tech in the Sun Bowl as the starter.
The Trojans open the season Aug. 29 at Hawaii. They will host Utah on Oct. 26.