The Guardians placed Cobb on the 15-day injured list Thursday due to a right hand blister, Zack Meisel of The Athletic reports.
Cobb had to be scratched from a scheduled start this past weekend due to the issue and didn't heal fast enough to avoid another stint on the IL. He'll be eligible to return during the final week of the season and should be ready to go by that time. Cobb's injury means both Joey Cantillo and Ben Lively (thigh), presuming the latter is healthy enough to do so, should remain in the Cleveland rotation.