Hollowell (shoulder) will begin a rehab assignment with Triple-A Iowa on Saturday, Meghan Montemurro of the Chicago Tribune reports.
Hollowell has been sidelined since late July with right shoulder inflammation, but he's ready to test things out in a game atmosphere. The right-handed reliever has allowed five runs (four earned) with a 13:8 K:BB over 14.1 innings during his time with the Cubs in 2026.