The Pirates outrighted Olivares to Triple-A Indianapolis on Saturday.
Olivares lost his spot on the 40-man roster this past Thursday, when the Pirates called up reliever Ben Heller from Triple-A Indianapolis in a corresponding move. Before he was designated for assignment, Olivares had been optioned to Triple-A shortly before the All-Star break after slashing .224/.291/.333 across 196 plate appearances with the big club. He hasn't fared much better during his time in Indianapolis this season, producing a .656 OPS through 63 plate appearances.