Cubs manager Craig Counsell said Thursday that Alzolay will undergo surgery on his right forearm, Tim Stebbins of MLB.com reports.
The date of Alzolay's surgery and the type of procedure he will receive are yet to be determined, though more details will come once he receives a second opinion. The 29-year-old righty has been sidelined since May due to a flexor strain, and a return timeline likely won't be available until after the surgery.