Gardner started the first four games for the Cardinals (4-1, 2-1 ACC) before suffering the knee injury in a Sept. 20 game at Florida International.
Bonnafon made his first career start in last week's 20-10 win against Wake Forest, passing for 206 yards while rushing 14 times for 46 yards. Bonnafon didn’t throw an interception or a touchdown but did lose two fumbles and was sacked four times by the Demon Deacons.
Gardner has completed 63 of 112 passes for the Cardinals, throwing for 798 yards, eight touchdowns and two interceptions this season. Both interceptions came in a Sept. 13 loss at Virginia.
Bonnafon is a more dangerous rusher than Gardner, and has 67 yards and two touchdowns on the ground in three games this season. He also played in relief of Gardner against Murray State and Virginia.
