The Pirates optioned Barco to Triple-A Indianapolis on Monday, Colin Beazley of the Pittsburgh Post-Gazette reports.
Barco cracked the Opening Day roster as a long reliever, but he was used sparingly and didn't pitch well on those occasions, allowing seven runs (five earned) with a 5:7 K:BB over seven innings of work. The southpaw will likely join the rotation at Indianapolis, where he can get stretched back out and wait for another opportunity in the majors.