Team sources say Fortt collided awkwardly with fellow linebacker Chris Colasanti and went numb in part of his body. As a precaution, he was taken by ambulance to a local hospital, where tests revealed a bruised disc in his spine.
He regained all feeling, was outfitted with a neck brace and released.
Fortt attended Friday's practice in street clothes, wearing the brace.
The Nittany Lions did not practice Saturday or Sunday. Fortt's status for Monday's practice at Jesuit High School -- which is expected to be a light session -- has yet to be determined.
However, team sources believe he will be available for Penn State's Outback Bowl matchup with Florida Saturday.