Dixon is the second player to join the Nittany Lions through the transfer portal this month.
"At some point, we will emerge from the pandemic, and we need to be ready to move decisively forward, guided by a vision that inspires all of us."
International students with extenuating circumstances can begin moving back into the dorms on January 4.
The defensive end is currently projected as a first-round pick by many.
"I've been wanting to do that my whole life. I love you, mom."
Shelton is the second Penn State defensive lineman to enter the transfer portal Wednesday, joining Judge Culpepper.