Gross-Matos spent three years with the Nittany Lions.
Barkley will reportedly join the Eagles after spending the first six seasons of his career with the New York Giants.
In Happy Valley, Bates tallied 37 appearances and was twice named to the All-Big Ten third team.
Tight end Theo Johnson recorded the second-best combine performance by a tight end since 1987.
Fashanu is expected to be a first-round pick in the 2024 NFL Draft.
Gaines was committed to the Nittany Lions for nearly a year.