Johnson suffered the injury in the 42–24 loss to Mississippi State last Saturday, and will be out indefinitely.
The Aggies were relying on Johnson to continue manning the quarterback position for a struggling Texas A&M offense. Johnson took over the starting job from Haynes King after two games in September. Johnson, who transferred to Texas A&M from LSU in the offseason, has thrown for 517 yards and three touchdowns in four games this season for the Aggies.
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