Morrow (biceps) threw a 25-pitch bullpen session Saturday, Mark Gonzales of the Chicago Tribune reports.

EDGE Analysis

Morrow has been on the shelf for nearly a month while dealing with right biceps inflammation. He's made significant progress of late, as he played catch Monday and Wednesday, and he threw 25 pitches off a mound Saturday. Morrow figures to require 2-to-3 more bullpens prior to embarking on a minor-league rehab stint, per Gonzales.