Falcons sign veteran safety Tyrell Johnson

FLOWERY BRANCH -- The Atlanta Falcons have added depth at safety by signing free agent Tyrell Johnson.<br /> <br /> Sunday's move comes after safety Dwight Lowery left Friday night's scrimmage with a concussion. Lowery missed most of the 2013 season with Jacksonville after suffering a concussion at Seattle on Sept. 22. He later was placed on injured reserve and released.<br /> <br /> Johnson, a second-round pick by Minnesota in 2008, played four seasons with the Vikings. He played four games with Detroit in 2012.<br /> <br /> The Falcons waived fullback Roosevelt Nix-Jones to clear a roster spot for Johnson.

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