The Trojans (3-2, 1-2 Pac-12) announced the extent of their all-conference center's injury Sunday, several hours after coach Steve Sarkisian took an indefinite leave of absence.
Tuerk was hurt during the Trojans' 17-12 loss to Washington on Thursday. The senior made the all-Pac-12 first team last season while starting every game.
Toa Lobendahn moved over to center from left guard after Tuerk was hurt.
Receiver Steven Mitchell is probable with a sprained ankle, and freshman cornerback Iman Marshall is healthy after incurring an abdomen injury against Washington.
AP college football website: collegefootball.ap.org