Oklahoma head coach Lincoln Riley, right, talks with quarterback Spencer Rattler (7) during the first half of an NCAA college football game against Kansas State in Manhattan, Kan., Saturday, Oct. 2 2021. (AP Photo/Orlin Wagner)

FILE - In this Oct. 12, 2019, file photo, Oklahoma, right, runs a play against Texas in the first half of an NCAA college football game at the Cotton Bowl in Dallas. The Big 12 will have nothing like the Red River rivalry on the second Saturday in October once Texas and Oklahoma make their move to the Southeastern Conference. (AP Photo/Jeffrey McWhorter, File)

Texas head coach Steve Sarkisian, right, congratulates quarterback Casey Thompson (11) after a touchdown pass against Texas Tech during the second half of an NCAA college football game on Saturday, Sept. 25, 2021, in Austin, Texas. (AP Photo/Chuck Burton)

FILE - In this Wednesday, Dec. 20, 2017 file photo, Newcastle quarterback Casey Thompson prepares to sign a letter of intent to play football for the University of Texas in Newcastle , Okla. His father, former University of Oklahoma quarterback Charles Thompson, is at left. Charles Thompson played a key role as a quarterback for Oklahoma teams that beat Texas in 1987 and 1988. He will be cheering for the rival Longhorns on Saturday, Oct. 9, 2021 when his son, Casey, starts at quarterback for 21st-ranked Texas. (Steve Sisney/The Oklahoman via AP, File)

Texas wide receiver Jordan Whittington (4) and teammate running back Bijan Robinson (5) celebrate Whittington's touchdown pass against TCU during the second half of an NCAA college football game Saturday, Oct. 2, 2021, in Fort Worth, Texas. Texas won 32-27. (AP Photo/Ron Jenkins)