Clifford tallied 15 receptions for 266 yards and a touchdown last season as a redshirt junior.
The two signal callers played the majority of reps in Penn State's spring game as they vie for the backup quarterback job.
"There's an opportunity here to join the room and compete."
"If I never had this opportunity, I don't know where I'd be."
King became the fifth Nittany Lion selected in this year's draft.
Reed tallied 181 total tackles, 12.5 tackles for loss, 3.5 sacks, 12 pass deflections, and five interceptions in 50 appearances for the Nittany Lions.