The Cubs designated Alzolay (elbow) for assignment Tuesday, Andy Martinez of Marquee Sports Network reports.

The Cubs are expected to designate Alzolay (elbow) for assignment Tuesday, Jesse Rogers of ESPN.com reports.

Cubs manager Craig Counsell said Wednesday that Alzolay will undergo Tommy John surgery on his injured right elbow, Tony Andracki of Marquee Sports Network reports.

Alzolay will undergo surgery on his right forearm, Tony Andracki of Marquee Sports Network reports.

Alzolay (forearm) has been pulled off his rehab assignment at Triple-A Iowa and sent to Chicago to be examined following a setback, Meghan Montemurro of the Chicago Tribune reports.

Alzolay's (forearm) rehab assignment was transferred to Triple-A Iowa on Saturday, Tommy Birch of USA Today reports.

Alzolay (forearm) will begin a rehab assignment with the Cubs' Arizona Complex League affiliate Friday, Patrick Mooney of The Athletic reports.

Alzolay (forearm) will throw live batting practice Friday, Meghan Montemurro of the Chicago Tribune reports.

Alzolay (forearm) threw a 30-pitch bullpen session Tuesday, Taylor McGregor of Marquee Sports Network reports.

Alzolay (forearm) played catch Tuesday up to 60 feet, Maddie Lee of the Chicago Sun-Times reports.