With an apparent knee injury,  Sean Clifford  leaves the game.

With an apparent knee injury, Sean Clifford leaves the game.

2- With an apparent left knee injury, he left Thursday's game in the third quarter.

3- After being inspected by trainers in the PSU locker room, the sixth-year quarterback was able to come back with less than 8 minutes left in the third quarter.

Clifford replaced Allar at quarterback when Penn State lead Purdue in the third quarter. Allar is a sought-after 5-star prospect.

5- Clifford completed 8 of 15 passes for 141 yards and two touchdowns in the first two quarters.

6- Last season, Clifford suffered another major injury during an away game.

7- As one of the top 30 players overall, Allar pledged to the Nittany Lions.