Oklahoma's defense was torched by a mobile quarterback in a loss to Kansas State last week.
The season might not get any easier for the No. 18 Sooners (3-1, 0-1) when they face QB Max Duggan and host TCU (3-0, 0-0) on Saturday in a Big 12 game at Fort Worth, Texas.
"Max is a great quarterback, looking a lot more athletic than he has in the past," Oklahoma linebacker DaShaun White said. "We're gonna go over there, and they're gonna try to put up whatever they're gonna try to put on us. Most important thing is that we come ready to play and stop the run. That's where it starts."