FRISCO, Texas -- Dallas Cowboys left tackle Tyron Smith will miss Sunday's game against the Falcons because of back and groin injuries.
The Cowboys said Saturday that Smith and tight end Geoff Swaim were downgraded from questionable to out and didn't make the trip to Atlanta. Swaim injured a knee in practice Thursday.
A four-time Pro Bowl selection who protects quarterback Dak Prescott's blind side, Smith has been battling back issues since last season, when he missed three games. The 26-year-old injured a groin in last weekend's win over Kansas City.