Van den Berg announced he was leaving the Nittany Lions at the end of February.
Per Ian Rapoport, Jones' contract is good for two years and worth up to $18 million.
Gillkin reportedly signed a two-year contract with the Cardinals after spending the 2023 season with Arizona.
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.