Freshman Jackson Arnold started the second half at quarterback for No. 14 Oklahoma against BYU after Dillon Gabriel suffered an apparent injury.
Gabriel was 13 of 21 for 191 yards and two touchdowns in the first half as the Sooners and Cougars were tied 17-17 going into the half in Provo, Utah. The Oklahoma radio broadcast said Gabriel had a head injury.
Arnold, the No. 3 player in the 2023 ESPN 300 rankings, was expected to redshirt this season, but with appearances in four earlier games this year, he won't be able to preserve it.