Gabriel was seen warming up in full uniform, pads and helmet in pregame drills, but he was in shorts and no pads at kickoff.
Davis Beville made his first start with the Sooners, going 6 of 12 for 38 yards and an interception at the Cotton Bowl in Dallas. In all, five players attempted a pass for the Sooners on Saturday.
Gabriel was knocked out of last week's loss to TCU in the second quarter when he was hit in the head while sliding by linebacker Jamoi Hodge, who was ejected for targeting.
Gabriel will be evaluated daily moving forward, the school said.