The Orioles traded Nicolas to the Nationals on Wednesday in exchange for infielder Randal Diaz.
Nicolas was pushed off the Orioles' 40-man roster Saturday, but he'll reclaim a roster spot upon joining the Nationals. The 27-year-old righty will report to Triple-A Rochester after turning in a 5.40 ERA and 2.30 WHIP across 20 innings in the minors this year.