A week after losing one of its top running backs, the Stanford football team sustained another offensive loss.
Redshirt junior left tackle Allen Smith (6-4, 298) required surgery on Monday to repair a torn patella tendon in his left knee and will miss at least six weeks and could possibly miss the rest of the season.
Smith hurt his knee on the third play of the game against Oregon on Saturday and never returned.
"He had been out best lineman through the first two games," Stanford coach Jim Harbaugh said on Tuesday. "The injury is such that we cannot assess it for at least six weeks."
The Cardinal (0-2, 1-2) lost sophomore Toby Gerhart for up to four weeks with an injury which occurred during the San Jose State game.
Smith, a Tempe native, will see his 23-game consecutive starting streak end. He did not start the first three games of his redshirt freshman season. He's started the last 22 games at left tackle and was counted upon to lead the much improved offensive line.
Redshirt junior Ben Muth (6-6, 301) replaced Smith against the Ducks and will make his first career start against Arizona State in Saturday's 7 p.m. contest.
"Ben did an outstanding job," Harbaugh said. "Now he gets a tremendous opportunity to show what he can do."
Smith became the second major causality of the young season, following linebacker Fred Campbell's retirement from football due to a neck injury.
"Allen is my roommate so I know its hurting him a lot and it will hurt the team too," Cardinal running back Anthony Kimble said. "But injuries are part of the game and we have to move on. Ben is capable."
Redshirt sophomore linebacker Clinton Snyder sustained a deep thigh bruise in the contest, and should be available for Saturday's game according to Harbaugh.
Arizona State (1-0, 4-0) is the third straight unbeaten Pac-10 team to visit Stanford Stadium this year. The 23rd-ranked Sun Devils have not won at Stanford since 1997.