The Pirates optioned Kelly to Triple-A Indianapolis on Saturday, Colin Beazley of the Pittsburgh Post-Gazette reports.
Kelly pitched three shutout innings during Friday's loss to the Reds, but he'll now be pushed off the big-league roster by Isaac Mattson in an effort to keep Pittsburgh's bullpen well-rested. Now with a 6.14 MLB ERA through 7.1 frames, Kelly could still return to the majors later in the year to supply the Pirates with length out of the pen.