Tennessee Titans quarterback Blaine Gabbert has been ruled out for the remainder of Sunday's game against the Jacksonville Jaguars due to a concussion, according to Jim Wyatt of the team's official site.
Gabbert was initially injured in the second drive of the game when he was sacked by Malik Jackson, who was called for a 15-yard penalty for illegal contact.
The injury forced Marcus Mariota into the game. Mariota was already dealing with an elbow injury but was active for Sunday's game in case of emergency.
This article will be updated to provide more information on this story as it becomes available.