The USC Trojans may enter the Goodyear Cotton Bowl Classic on Friday night without two key defensive players. Coach Clay Helton said Thursday that linebacker Porter Gustin is unlikely to play as No. 8 USC meets No. 5 Ohio State at AT&T Stadium in Arlington, Texas. Helton said cornerback Jack Jones would be a game-time decision for the first of the New Year's Six bowl games. Jones, a third-team AP All-American who leads USC with four interceptions, suffered an ankle injury in the Pac-12 championship game on Dec. 1. The sophomore has received limited work in practice this week.