Andrew Luck will miss Thursday's tilt versus the Pittsburgh Steelers.
The Indianapolis Colts officially declared the quarterback out on Thanksgiving due to a concussion.
Luck suffered the concussion in the fourth quarter of Sunday's victory over the Tennessee Titans when his head bounced off the turf. After entering protocol, it was always a long-shot Luck would be cleared to play on a short week. He will now have extra time to heal before the Colts face the Jets on Monday night on Dec.