The Tigers transferred Hurter (back) to Triple-A Toledo on Saturday to begin a rehab assignment, Emily Waldon of Baseball America reports.
Hurter has been on the injured list since late May due to lumbar spine inflammation. He began throwing in late July and is now ready to get back into game action. Hurter is eligible to come off the IL at any time, but he'll probably need to log multiple outings with Toledo before doing so.