"Nobody had us picked to come this far, but we're here. We're here to prove that we didn't just make it, we're here to win games."
While some Nittany Lions answered questions for the media, others took part in some intense games of Jenga.
O'Brien also teased the possibility of playing one game at Gillette Stadium, the home field of the New England Patriots.
"You give them two yards of plus-yardage, and they get their head of steam going, and that makes an effective running back."
Castro-Fields played five years with the Nittany Lions before being drafted by the 49ers in 2022.
Franklin would be the third coach in school history to win the award.