The Cowboys will release quarterback Kellen Moore, according to a source, but he could rejoin the team as early as Sunday.
Moore is practice squad eligible but and will likely go back to the active roster.
In the meantime, undrafted rookie Cooper Rush is set to be Dak Prescott's backup going into the regular season against the New York Giants.
Rush completed 38 of 51 passes for 398 yards in the preseason with six touchdowns and no interceptions.