Marcus Mariota is not expected to play in the Tennessee Titans' pivotal Week 17 game against the Colts with a playoff berth on the line. 

Mariota is dealing with a nerve issue that is putting his overall playing status in jeopardy.

Mariota is officially listed as questionable and reportedly will test his arm in pregame warm-ups. But one source told ESPN that an independent spine specialist has warned the Titans that further damage would put Mariota's ability to throw the football at significant risk beyond this weekend.

Blaine Gabbert will start in place of Mariota.