Trojans linebacker Cameron Smith (35) runs the ball after an interception against the Utah Utes in October.
LOS ANGELES -- Southern California linebackers Cameron Smith and Lamar Dawson are out for the season with injuries.
Interim coach Clay Helton announced the prognosis for both players Saturday night.
USC (7-3, 5-2 Pac-12) beat Colorado 27-24 Friday for its fourth consecutive victory under Helton.
Smith leads the Trojans with 78 tackles as a freshman, making three interceptions and growing into a starring role. He was injured in the second quarter in Boulder, limping off the field with a torn ligament in his knee.