Oklahoma coach Riley won't name starting QB before TCU game

Oklahoma quarterback Spencer Rattler hugs Texas quarterback Casey Thompson after Oklahoma beat Texas in an NCAA college football game at the Cotton Bowl, Saturday, Oct. 9, 2021, in Dallas. (AP Photo/Jeffrey McWhorter)

Oklahoma quarterback Caleb Williams (13) looks to pass during the first half of an NCAA college football game against Texas at the Cotton Bowl, Saturday, Oct. 9, 2021, in Dallas. (AP Photo/Jeffrey McWhorter)

Oklahoma head coach Lincoln Riley talks with quarterback Caleb Williams (13), who replaced Spencer Rattler during the game, and wide receiver Michael Woods II (8) during the second half of an NCAA college football game against Texas at the Cotton Bowl, Saturday, Oct. 9, 2021, in Dallas. Oklahoma won 54-48. (AP Photo/Jeffrey McWhorter)

Oklahoma quarterback Spencer Rattler (7) is sacked by Texas defensive lineman Alfred Collins (95) during the first half of an NCAA college football game at the Cotton Bowl, Saturday, Oct. 9, 2021, in Dallas. (AP Photo/Jeffrey McWhorter)

Oklahoma quarterback Caleb Williams (13) puts on the Golden Hat after coming off the bench to lead Oklahoma to a 54-48 win over Texas in an NCAA college football game at the Cotton Bowl, Saturday, Oct. 9, 2021, in Dallas. (AP Photo/Jeffrey McWhorter)

Oklahoma head coach Lincoln Riley talks to quarterback Spencer Rattler before sending Rattler in for a two-point conversion during the second half of an NCAA college football game against Texas at the Cotton Bowl, Saturday, Oct. 9, 2021, in Dallas. (AP Photo/Jeffrey McWhorter)