Johnson, who had two 1,000-yard rushing seasons during his heyday with the Kansas City Chiefs, played in two games for the Skins this season and gained just two yards on five carries.
General Manager Bruce Allen said in a written statement that Johnson was dropped to clear roster space, even though the Redskins were left with only Clinton Portis and rookie Keiland Williams at the running back position.
Johnson, a 30-year-old two-time Pro Bowler, played for the Chiefs from 2003 until 2009 when he split the season between Kansas City and Cincinnati.
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