Joseph reportedly became the fourth Penn State player to enter the transfer portal this offseason after serving as a backup on the team's defensive line for the past three seasons.
Stefen Wisniewski, Jordan Lucas, Robbie Gould, Kevin Givens, and Anthony Zettel will represent the Nittany Lions at Super Bowl LIV on February 2.
Stubblefield was an All-American wide receiver for Purdue in 2004, and he has more than a decade of experience coaching wide receivers at the collegiate level.
Robert Windsor, Cam Brown, John Reid, Steven Gonzalez, and Dan Chisena have all been selected to post-season all-star contests.
Jordan last played for the Nittany Lions in 2018 and last appeared on the team's active roster in August.
The duo also appeared on ESPN's All-Bowl team.