The addition of McClain gives the Nittany Lions their second transfer pass catcher of the offseason.
The 6'2", 220-pound linebacker chose Penn State over Big Ten programs Michigan and Ohio State, as well as Pitt and Boston College, among others.
Saquon Barkley and Mike Gesicki scored their first career postseason touchdowns during Super Wild Card Weekend.
Several names with established ties to James Franklin and Happy Valley could be in the mix to replace Taylor Stubblefield.
Wilson has served as a consistent contributor for Penn State, totaling 55 tackles, two interceptions, and three forced fumbles in his career.
Penn State will be represented in the Super Bowl this season for the 52nd time ever.