The Tennessee Titans placed starting quarterback Marcus Mariota on injured reserve on Tuesday, one day before he undergoes surgery to repair the fractured right fibula he suffered during Saturday's loss to the Jacksonville Jaguars.
Tanney has played in one NFL game and that was Tennessee's 2015 regular-season finale against the Indianapolis Colts. He completed 10 of 14 passes for 99 yards and one touchdown.
Tanney, 29, has been on seven NFL practice squads during his career. In addition to the Titans, he has been on the practice squads of the Kansas City Chiefs, Dallas Cowboys, Cleveland Browns, Tampa Bay Buccaneers, Buffalo Bills and Indianapolis Colts.
He played college football for Monmouth College, a Division III school in Illinois.
Mariota is expected to require a recovery time of four to five months.