Bolanos (elbow) was cleared to begin a rehab assignment with the Royals' rookie-level Arizona Complex League affiliate Tuesday.
Bolanos has been on the injured list since mid-June with a strained right elbow, but he looks like he's finally ready to ramp up again. The right-hander isn't eligible to return from the 60-day injured list until mid-August, so he'll likely make at least a few rehab start across multiple affiliates before being reinstated.