The Guardians recalled Aleman from Triple-A Columbus on Friday, Francys Romero of BeisbolFR.com reports.
Aleman has been dominant at Columbus this season, authoring a 0.32 ERA and 43:7 K:BB over 28.1 innings. The big righty gave up one run over two outings covering 2.2 frames earlier this season with the big club. Aleman has the upside to be used in high-leverage situations, but the Guardians will likely deploy him in middle relief for now.