The Cowboys have struggled with depth on their interior offensive line all preseason, and the unit has been leaky since the beginning of training camp. Dallas signed free agents Nate Livings and Mackenzy Bernadeau during the offseason to solidify the inside of its offensive line, but both players have battled injuries in the preseason. Center Phil Costa also has been limited with a back injury.
Cook has started 40 games in his NFL career, playing center, guard and tackle. He appeared in seven games with no starts last season.