Mike Vrabel: Titans to start QB Joshua Dobbs vs. Jaguars 1:22 PM ET ESPN The Tennessee Titans will start Joshua Dobbs at quarterback in Saturday's defacto AFC South title game against the Jacksonville Jaguars , coach Mike Vrabel announced Monday. The winner of Saturday night's game in Jacksonville (8:15 p.m., ESPN/ABC ) will win the division title. The Titans (7-9) have lost six straight games, including last Thursday night against the Dallas Cowboys in which Dobbs made his first NFL start. Dobbs completed 20 of 39 passes for 232 yards with a touchdown and interception in the 27-13 loss. The Titans turned to Dobbs over rookie Malik Willis , who has been ineffective in three starts. Willis, selected in the third round of this year's draft, has failed to pass for 100 yards or complete a touchdown pass in any of his three starts in place of Tannehill. The Titans are 1-2 in his starts despite Willis completing just 50.8% of his passes and having three passes intercepted. He has rushed for 123 yards and a touchdown. Titans starting quarterback Ryan Tannehill is out for the rest of the regular season and likely the postseason, if Tennessee qualifies, after undergoing surgery for a high right ankle sprain this month, sources told ESPN's Adam Schefter. The Titans officially placed Tannehill on injured reserve last Thursday, meaning he will have to miss at least three games before he could return. The Jaguars (8-8) have won four straight games entering Saturday's game. ESPN's Turron Davenport contributed to this report.