Barraclough was designated for assignment by Washington on Tuesday, Jamal Collier of MLB.com reports.
Barraclough was booted off the 40-man roster to make room for Asdrubal Cabrera, who was signed by the Nationals on Monday. Barraclough will now be subjected to waivers after posting a 6.66 ERA with 30 strikeouts over 25.2 innings in the big leagues this season.