The Facts: Tannehill underwent ankle surgery this week, leaving him as a "long shot" to play again this season, league sources told ESPN.

Diehards Line: Tannehill is rehabbing in an effort to do whatever he can to try make it back over the next few weeks, and the Titans have not given up hope that someone as tough as the former Pro Bowler could make it back this season. But a return this season undoubtedly will be a challenging task, and the Titans (7-7) now must rely on rookie quarterback Malik Willis to lead them to an AFC South title and a postseason spot. Tennessee, which has won the AFC South each of the past two seasons, will host the Houston Texans (1-12-1) on Saturday -- the same team Willis made his first NFL start against on Oct. 30 in a 17-10 win. The Titans close the regular season at home against the Dallas Cowboys in Week 17 and on the road at Jacksonville the following week.