An MRI confirmed Alzolay is dealing with a right flexor strain, Meghan Montemurro of the Chicago Tribune reports.
Alzolay was placed on the 15-day injured list Monday and imaging has confirmed the initial diagnosis. He will be shut down for five days before being reevaluated. Most likely, the injury is going to require longer than a minimum stay on the IL. Hector Neris will continue to serve as the Cubs' primary ninth-inning option.