Tennessee Titans head coach Mike Munchak confirmed Monday that quarterback Jake Locker will not play the rest of the season after suffering a foot injury in Sunday's game.
Locker injured his right foot in the second quarter of the Titans' 29-27 loss to the previously winless Jacksonville Jaguars.
Ryan Fitzpatrick will take over as the starting quarterback, and Rusty Smith will move up as his backup.
"It's very disappointing. It's hard for the team. To lose him now is a huge blow," Munchak said.
Locker's injury, called a Lisfranc injury, involves a ligament that runs down the center of the foot and holds the arch of the foot in line. Bone experts at Vanderbilt University Medical Center said a torn ligament usually requires surgery.
"Without this ligament, you can't really push off to throw or jump, so it's really important for athletic activity. So, if you injure this, it's usually a significant injury. It can be associated with other injuries, such as fractures. But, oftentimes it requires surgery to fix, so it doesn't cause any long-term problems," said Dr. Andrew Gregory, associate professor at Vanderbilt.
Gregory said an injury like this is unlikely to be a career-ender. He said that athletes who get immediate treatment are usually able to return to the game after extensive rehab.
Locker is 8-10 since becoming a starter, but will wind up missing 14 of a possible 32 starts in his first two seasons.
Munchak says they don't know yet if Locker will need surgery.
The Titans (4-5) host the division-leading Indianapolis Colts on Thursday night at LP Field.
Copyright 2013 WSMV (Meredith Corporation). All rights reserved. The Associated Press contributed to this report.