The Indianapolis Colts could be without Andrew Luck in Thursday’s game vs the Pittsburgh Steelers.

Colts coach Chuck Pagano announced today Luck is in the concussion protocol, putting his status up in the air for Thursday night. 29 Year old Scott Tolzien would be in line to start if Luck can’t go.

Tolzien has completed 56 of 91 passes (61.5%) for 721 yards with 1 touchdown and 5 interceptions in his career. He has made two career starts, both with Green Bay in 2013.