NASHVILLE, Tenn. -- The Tennessee Titans are 99 percent certain starting quarterback Jake Locker will miss the remainder of the season with a foot injury suffered in Sunday's loss to the previously winless Jacksonville Jaguars, a source told ESPN.com.
A second source added on Locker's injury: "It does not look good."
The Tennessean reported that the Titans believe Locker suffered a Lisfranc injury that could require surgery.
Locker was hurt late in the first half of a 29-27 loss at LP Field. He ran for an 8-yard gain on an option play involving Chris Johnson and was hurt, but didn't leave the field. On the next play, he failed to get to Johnson for a wide handoff and fumbled it, and he was replaced by Ryan Fitzpatrick on the following series.
He watched the second half and conducted a postgame news conference on crutches wearing an immobilizing boot.
"I really don't know how it happened," he said. "Just when I got up I could feel it."
Locker will have further tests Monday and said he's hoping and praying the injury is not season-ending.
Locker suffered a sprained right hip and right knee in the Titans' Sept. 29 win against the Jets. Fitzpatrick played poorly in two losses while he was out.
Against the Jaguars, Fitzpatrick had the Titans in position to drive for a field goal that could have won the game. But cornerback Will Blackmon stripped him, took the ball away and ran for a touchdown that extended Jacksonville's lead to 29-20 with 2:32 left in the game.
Rusty Smith is the Titans' No. 3 quarterback and backed up Fitzpatrick while Locker was out previously.