The graduate student will have one year of eligibility remaining.
McSorley is listed in the Penn State directory.
The first 2,000 fans will receive a Singleton bobblehead.
McGloin will reunite with former Penn State head coach Bill O'Brien.
Carter has not fully recovered from his shoulder injury sustained against Boise State in the Fiesta Bowl on December 31.
"Nobody knows it, but I'm dropping it, right now."