FRISCO, Texas -- Since Doug Free is retiring and there's no clear-cut choice to play right tackle, the Dallas Cowboys have agreed to terms with offensive tackle Byron Bell on a one-year deal, according to sources.

Bell, 28, did not play last season with the Tennessee Titans because of a dislocated ankle. Before last season, he started 72 of 78 career games for the Carolina Panthers and Titans.

The addition of Bell gives the Cowboys options on the offensive line. Free’s retirement had the Cowboys contemplating giving left guard La’el Collins a look at right tackle. Chaz Green was drafted in the third round of the 2015 draft with the idea that he would be the right tackle of the future, but he has played only four games in two seasons because of hip and back surgeries.

If Bell proves healthy and wins the job, the Cowboys' offensive line would be among the deeper lines in football. All-Pros Tyron Smith, Travis Frederick and Zack Martin would man the left tackle, center and right guard spots, respectively. Collins, a highly touted prospect two years ago, would remain at left guard.

The Cowboys re-signed Jonathan Cooper, a former top-10 pick in 2013, to a one-year deal, and he can play guard or center. Joe Looney served as the backup interior offensive lineman on game day and saw time as a blocking tight end late in the season.

The Cowboys have yet to place Free on the reserve/retired list, which would open up $5 million in cap space. Once the Cowboys place him on the list, he will remain under their control if he opts to play again.