The Pirates recalled Jefferies from Triple-A Indianapolis on Wednesday, Noah Hiles of the Pittsburgh Post-Gazette reports.
Jefferies will serve as Pittsburgh's 27th man for Wednesday's doubleheader in Detroit. The righty was acquired from the Giants earlier this month and has allowed six runs with a 4:4 K:BB over six innings covering two starts with Indianapolis since the trade. Jefferies will give the Pirates bullpen some length during the doubleheader.