Air Force may be without Broam Hart this week after the fullback suffered a concussion in the second quarter against Wyoming.
Coach Troy Calhoun said it was difficult to pinpoint which play the injury occurred and didn't know if it was when Hart was running the ball or blocking.
Hart didn't return to the game in the second half.
"We're extra, extra cautious because it comes into play in being commissioned and in certain career fields, too," Calhoun said.
Hart leads Air Force (1-3, 0-3 Mountain West) with 49 rushing attempts and has run for 204 yards and two touchdowns.
Junior Paco Solano ran with the first team in practice Monday in place of Hart.
One Air Force player who surprisingly didn't come away with a concussion in the loss was running back Anthony LaCoste.
LaCoste looked as though he was knocked unconscious on a vicious hit from Cowboys linebacker Nehemie Kankolongo on a kickoff return. LaCoste fumbled as he fell backward on the play.
LaCoste returned to the game and scored a touchdown. He practiced Monday and it is assumed he will play Saturday at Nevada.
Kankolongo, however, will not play next week against Texas State. The Mountain West suspended him for one game for "targeting and initiating contact against an opponent with the crown of the helmet."
Kankolongo was not flagged for the hit, but the disciplinary action resulted from the weekly review conducted by the Colorado Springs-based conference office.
Calhoun would not say if he felt the hit warranted a suspension, but he did say LaCoste was thoroughly checked out before returning to the field.
"We went through every rigid and strict filter just because of the hit that was involved," Calhoun said. "He was clean."
Receiver Ty MacArthur did not practice Monday as he continues to recover from a concussion he suffered against Boise State in the season's third game.
Wyoming quarterback Brett Smith was selected as the Mountain West's offensive player of the week after accounting for a school-record 511 yards of offense against Air Force. It's the second week in a row that an Air Force opponent earned conference recognition. Boise State defensive end Demarcus Lawrence took defensive honors for Week 3.
Notre Dame tickets on sale
Air Force sold about 3,100 of the roughly 9,000 remaining tickets to the Oct. 26 game against Notre Dame on Monday, the first day that single-game tickets to the contest were available.
The ticket prices are marked up significantly, ranging from $70-$125. By comparison, seats for the Oct. 10 game against San Diego State range from $10-$55.