The Guardians optioned Herrin to Triple-A Columbus on Tuesday, Ryan Lewis of the Akron Beacon Journal reports.
EDGE Analysis
Herrin threw 1.2 innings and 31 pitches in Monday's 6-0 loss to the Rockies and is being replaced in the bullpen with a fresh arm in Konnor Pilkington, who was recalled from Triple-A in a corresponding move. Over nine relief appearances this season, Herrin holds a 7.45 ERA.