A source tells ESPN that the Titans are 99 percent certain Jake Locker (foot) is out for the season. The Titans fear Locker sustained a Lisfranc injury that could require surgery. Further testing Monday is expected to confirm those suspicions. It leaves the 4-5 Titans with Ryan Fitzpatrick as their starter and Rusty Smith as the backup going forward. Locker, who missed five games last year due to two shoulder injuries and then two more this year due to a hip injury, is earning an injury-prone label. His rookie contract expires after next season.