Johnson signed with the Cowboys on Thursday.
Johnson gives the Cowboys some depth at quarterback with Tony Romo (back) out for the foreseeable future and Kellen Moore (lower leg) starting the season on IR. The 28-year-old spent some time with the Ravens this offseason and has bounced around the league his entire career, never finding a stable backup gig. Johnson gives the Cowboys depth for their game Thursday night against the Texans, although it is unknown how much he will play, if at all. Presumed starter Dak Prescott will not suit up for the preseason finale, leaving just Johnson and Jameill Showers under center.