Alzolay (forearm) will throw live batting practice Friday, Meghan Montemurro of the Chicago Tribune reports.
Alzolay threw a 30-pitch bullpen session Tuesday and is set to face batters for the first time since being placed on the injured list in mid-May. The 29-year-old has been rehabbing at the Cubs' Arizona complex, and he'll likely require a handful of minor-league rehab outings before being activated.