Andrew Carnahan, the Arizona State football team's most experienced offensive lineman, suffered what was likely a season-ending right knee injury in Saturday's game at California.
Sun Devils coach Dirk Koetter said Tuesday during the weekly Pac-10 teleconference coaches' call that "it doesn't look good" for Carnahan, who has an anterior cruciate ligament injury and a bone bruise.
"The knee got a lot of swelling in it after the game," Koetter said. "He's probably done for the season, although (the doctors) are not 100 percent sure."
Carnahan, a 6-foot-8, 288-pound senior who has started 37 games for the Sun Devils, had his right knee severely bent backwards on an extra-point attempt in the second quarter of ASU's 49-21 loss. He underwent an MRI exam on Monday.
He was replaced for the rest of the game by redshirt freshman Richard Tuitu'u, but Koetter said that ASU's philosophy is to have "the best five guys" on the offensive line. As a result, senior right guard Stephen Berg could move to tackle, with sophomore Paul Fanaika taking Berg's guard spot.
With Berg missing Saturday's game due to a concussion, Fanaika filled in and graded out the best among the offensive linemen, Koetter said. Berg is expected to return for this week's game against Oregon.