Bruce Feldman of the New York Times confirmed the report, adding that the retirement is "effective immediately."
"After 18 years at the University of Oklahoma, I’ve decided to step down as the head football coach. I understand there has been some speculation about my health. My health was not the deciding factor in this decision and I’ve had no incidents that would prevent me from coaching. I feel the timing is perfect to hand over the reins. The program is in tremendous shape. We have outstanding players and coaches and are poised to make another run at a Big 12 and national championship. We have new state-of-the-art facilities and a great start on next year’s recruiting class. The time is now because Lincoln Riley will provide a seamless transition as the new head coach, capitalizing on an excellent staff that is already in place and providing familiarity and confidence for our players. Now is simply the ideal time for me and our program to make this transition."