Singleton gashed Ohio's defense for 179 yards and two touchdowns on just 10 carries.
There are 46 former Penn State football players, as well as five who serve as coaches, on NFL rosters ahead of the 2022 season.
McSorley was promoted to the Arizona Cardinals' active roster on Wednesday after the team placed backup quarterback Colt McCoy on injured reserve.
The Steelers will retire Harris' number at halftime of the team's December 24 game against the Raiders in honor of the 50th anniversary of the "Immaculate Reception."
ESPN's Pete Thamel is reporting that the 12-team model is expected to start in 2026.
Castro-Fields will reunite with Penn State teammates Jahan Dotson and Shaka Toney in Washington DC.