Harrington (shoulder) has been sent to Single-A Bradenton to begin a rehab assignment, Andrew Destin of the Pittsburgh Post-Gazette reports.
Harrington has been sidelined since late March with a right rotator cuff strain and is finally ready to pitch in games. The 22-year-old will likely be eventually assigned to Double-A Altoona after finishing the 2023 campaign at Single-A Greensboro.