Urena signed a minor-league contract with the Nationals on Wednesday, Bobby Blanco of MASNSports.com reports.
Urena was released by the Rockies last week after posting a 9.82 ERA and 2.24 WHIP across 18.1 innings this season. He'll report to Triple-A Rochester, where he'll join the rotation and wait for a call from the major-league club. Given the state of the rebuilding Nationals' roster, he'll probably get one eventually.