Marcus Mariota carted off with broken leg as Titans lose to Jags

4:51 PM ET

JACKSONVILLE, Fla. — Tennessee Titans quarterback Marcus Mariota suffered a fractured right fibula in Saturday’s 38-17 loss to the Jacksonville Jaguars, the team announced.

Titans lose to Jaguars, lose Marcus Mariota and could lose division tonight

In a disastrous Christmas Eve game in Jacksonville, the Titans lose a game, their quarterback and perhaps the AFC South.

Mariota was carted off in the third quarter with an air cast on his right leg after being sacked from behind by Jaguars DT Sheldon Day. He did not return.

“It’s the first time this season we have been beaten like that,” said Titans coach Mike Mularkey. “It’s a bad time for it.”

Matt Cassel, the Titans’ backup, came on to replace Mariota. Cassel completed 13 of 24 passes for 124 yards with one touchdown and one interception.

At the time of his injury, Mariota had thrown for 99 yards on 8-of-20 passing with one touchdown.