Source - Titans' Ryan Tannehill out for rest of regular season - ESPN
NFL Injury Roundup: Titans rule out QB Tannehill, Willis to make first NFL start
Ryan Tannehill injury update: Titans QB ruled out for Week 16 vs. Texans, likely done for season after ankle surgery - DraftKings Network
Titans' Ryan Tannehill ill; Malik Willis to start vs. Texans - ESPN
Ryan Tannehill out, Titans to start QB Malik Willis vs Houston
Titans QB Ryan Tannehill 'very likely done for the season,' per report
Titans QB Malik Willis will start Sunday vs. Texans as Ryan Tannehill misses game with ankle injury, illness
Report: Titans' Ryan Tannehill Likely Out for Season Because of Ankle Injury, News, Scores, Highlights, Stats, and Rumors
Titans QB Ryan Tannehill “Progressing” While Getting Treatment for Ankle Injury on Monday