Bostick was recalled from Triple-A Indianapolis on Sunday.
Bostick will provide the Pirates with extra infield depth following the placement of Josh Harrison (broken hand) on the DL. The 24-year-old is hitless in for major-league at-bats this season, but sports a .779 OPS at the minor-league level. Both Bostick and Max Moroff should see chances in the infield, though Sean Rodriguez is seemingly the main candidate to pick up reps left behind by Harrison.