Curtis (side) was reinstated from Triple-A Indianapolis' 7-day injured list Wednesday, Dominic Campbell of SI.com reports.
Curtis has been sidelined by side discomfort since July 25, but he's progressed enough in his recovery to return to the Triple-A squad. He made his major-league debut with the Pirates on July 18, when he operated in a bulk-relief role against the Guardians and allowed two hits and two walks while striking out four across five scoreless innings. Curtis has a 5.84 ERA and 1.69 WHIP over 24.2 innings in the minors this season but could see some major-league action over the final weeks of the regular season.