Clifford was elevated after starter Jordan Love went down with an injury.
Clifford was released by the Packers a day prior.
Clifford was Penn State's leader in wins as a starting quarterback, passing yards, total yards, and passing touchdowns.
Clifford will be the backup behind Jordan Love.
After Clifford's post-draft arrival in Green Bay, the former Penn State quarterback nabbed the old locker of an NFL legend.
Clifford was selected in the fifth round of the 2023 NFL Draft on Saturday.