Tanney will serve as the team's back-up for Sunday's game against the Houston Texans.

Matt Cassel will start for the Titans after starter Marcus Mariota suffered a fractured right fibula in Saturday's loss to the Jaguars.

Mariota was officially placed on Injured Reserve on Tuesday. He's scheduled for surgery tomorrow in Charlotte, N.C.

The Titans first added Tanney to their practice squad for the final two weeks of the 2014 campaign to add depth at quarterback. Tanney spent the final two weeks of the 2015 season on the Titans active roster and saw his first regular season action in the finale against the Colts, when he completed 10 of 14 passes for 99 yards with a touchdown.

Tanney spent the 2015 offseason and training camp with the Titans before stints on the practice squad for the Bills and Colts. Prior to his arrival in Tennessee, the Monmouth product also spent time with the Chiefs, Cowboys, Browns and Buccaneers.