FILE - In this Oct. 7, 2017, file photo, Clemson quarterback Hunter Johnson celebrates after throwing a touchdown against Wake Forest during the second half of an NCAA college football game in Clemson, S.C. Northwestern must replace four-year starter Clayton Thorson, and Clemson backup Johnson is expected to have the inside track. Coach Pat Fitzgerald also is giving fifth-year senior TJ Green a look. (AP Photo/Rainier Ehrhardt, File)

FILE - In this Oct. 7, 2017, file photo, then-Clemson quarterback Hunter Johnson celebrates after throwing a touchdown against Wake Forest during the second half of an NCAA college football game in Clemson, S.C. As he listened to his team’s introduction during last month’s Big Ten Kickoff Luncheon, Northwestern coach Pat Fitzgerald was a bit stunned by what he heard. “Clayton Thorson leaves as the winningest quarterback in Northwestern history,” the Big Ten Network’s Rick Pizzo said, reading from a script. “But he’ll be replaced by five-star Clemson transfer Hunter Johnson.” That was news to Fitzgerald, who said the competition for starting quarterback at the beginning of fall camp was wide open with Hunter, senior TJ Green and junior Aidan Smith being the main contenders. (AP Photo/Rainier Ehrhardt, File)