AP

First-round rookie Justin Pugh has yet to crack the starting lineup with the Giants. His effort to climb that mountain in his first season has gotten a bit more complicated.

Coach Tom Coughlin told reporters on Friday that Pugh “took a shot in the head” at practice on Thursday, via Ralph Vacchiano of the New York Daily News. Pugh has sustained a concussion, and Coughlin said the former Syracuse left tackle is having headaches.

He’s currently out until he progresses through the concussion protocol, which mandates clearance by an independent neurologist.

Pugh is battling veteran David Diehl for the starting right tackle position.