Hartlieb was designated for assignment by the Pirates on Saturday.
Hartlieb was sent to Triple-A Indianapolis in late June, and he'll now be cast off the 40-man roster after the Pirates acquired John Nogowski from the Cardinals on Saturday. The right-hander has posted a 1.86 ERA and 0.98 WHIP in 9.2 innings across nine relief appearances in the minors this year, but he could remain in the organization if he goes unclaimed on waivers.