James Franklin announced Reynolds would "transition to a green light," during his Monday press conference.
The Nittany Lions close out the Penn State Invitational against St. John's at 6:30 p.m. Saturday.
The Nittany Lions' depth has been tested throughout the first two games of the season.
Rappleyea was ruled out of Saturday's game against Bowling Green.
The Nittany Lions had 234 combined rushing yards in Saturday's win.
Penn State returns home to take on the Falcons on Saturday.