The Cowboys worked out a slew of quarterbacks on Tuesday and have appeared to settle on a roster addition to provide additional depth in the way of Tony Romo's back injury.

The quarterback whom the Cowboys are adding was not a part of the workouts. Dallas is bringing back Jon Kitna, who was settled in as a 41-year-old high school math teacher and football coach in Tacoma, Wash.

Kitna was expected to arrive in Dallas on Tuesday night and undergo a physical on Wednesday before making the roster move official.  The Cowboys announced the move officially on Wednesday. Kitna was with the Cowboys from 2009-11 and started nine games in 2010 when Romo was sidelined with a broken clavicle. Kitna retired after the 2011 season.

In the event Romo can't play, Kitna would serve as the backup to Kyle Orton, who has not started a game since the 2011 season. Romo and Orton are currently the only quarterbacks on Dallas' active roster and practice squad.

ESPN's Adam Schefter reported on Monday afternoon that Romo was done for the year due to a herniated disc in his back. The Cowboys have publicly denied the report hoping there is a chance Romo can suit up. NFL Network's Ian Rapoport added that Romo received an epidural to try and ease the back pain.

The Cowboys worked out four quarterbacks on Tuesday - David Carr, Caleb Hanie, John Skelton and Tyler Thigpen.

Dallas parted ways with return specialist Micheal Spurlock to make room for Kitna. That is significant because receiver/returner Dwayne Harris is likely to return to the lineup after missing two games with a hamstring injury. Harris is averaging 30.5 yards per kick return and 14 yards per punt return.