Sunday was the first day that the Cowboys could have placed Romo on injured reserve and the team opted not to do so.
At the same time, the signing of veteran quarterback Mark Sanchez was officially announced and young quarterback Jameill Showers was waived.
Sanchez was signed for one season to be the backup after being released by the Denver Broncos on Saturday. Rookie Dak Prescott will be the starter when the Cowboys face the New York Giants in their season opener on Sept. 11.
Romo suffered a compression fracture in his back in a preseason game against Seattle on Aug. 25. It is estimated that he will be sidelined 6-to-10 weeks.
If Romo is placed on injured reserve, he will be forced to miss the first eight weeks of the NFL season and won't be eligible to play until November.
The Cowboys could choose not to place Romo on injured reserve and name him as one of their inactives each week until he recovers.
Dallas also could re-sign Showers to the practice squad if he clears waivers. Showers struggled in the preseason finale against the Houston Texans when he was 10-of-25 passing for 91 yards, one touchdown and one interception.
The Cowboys' original projected backup quarterback was Kellen Moore, who is out for the season after breaking his left ankle.