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.
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.