The Cougars also lost Keenum’s backup, Cotton Turner, for the season Saturday night with a broken collar bone.
Turner broke his clavicle in the third quarter.
Keenum, a senior, had 636 yards passing and five touchdowns this season.
The Cougars will likely go with freshman Terrance Broadway in the wake of the injuries.
Keenum suffered a concussion last week trying to make a tackle after an interception against UTEP.
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