The Nationals have designated Brett Carroll for assignment in order to make room for Rick Ankiel, according to Adam Kilgore of the Washington Post (via Twitter). The outfielder made just one plate appearance for Washington this season.
Carroll, 29, appeared in 173 games for the Marlins from 2007 through 2010 but has seen limited action in the big leagues since then. The right-handed hitter has put up strong numbers in Triple-A for his career, posting a .277/.343/.500 slash line in parts of five seasons.
The veteran was signed by Washington in December to help bridge the gap between Opening Day and Bryce Harper's eventual promotion.