Nwosu was Penn State's kickoff specialist for the last four seasons.
The two-time team captain will look for a new home at the next level.
Shelton was a two-year full-time starter for the Nittany Lions.
Penn State has landed its first four-star recruit in the 2027 recruiting class.
Blattner becomes the first defensive lineman to join Penn State's 2027 class.
The Mannelly Award finalist will look to continue a thankless job in the NFL.