Posted by ESPN.com's Tim Griffin
Texas A&M coach Mike Sherman declined Monday to reveal who would be his starting quarterback for Saturday's game against Baylor.
McGee replaced him at that point and completed 10 of 19 passes for 82 yards and a touchdown while playing the rest of the game.
"We'll just play it by ear," Sherman said. "Both are capable of playing and we'll just see how it goes."
Johnson struggled through the worst game of his career, completing only 11-of-31 passes for 162 yards. He was sacked three times as well as the two interceptions.
McGee won the Aggies' starting position in training camp and was A&M's starter at the position for the first two games before sustaining a shoulder injury in the second game against New Mexico. McGee returned to start against Army before he was supplanted by Johnson, who has emerged in a record-breaking sophomore season.