Dunn (shoulder) will begin a rehab assignment with High-A Dayton on Sunday, Charlie Goldsmith of The Cincinnati Enquirer reports.
Dunn was acquired in a trade with the Mariners in March but has spent the entirety of his time with his new organization recovering from the shoulder strain he suffered last June. He's nearly ready for game action, though given the length of his absence, he'll likely need several rehab outings before being activated off the injured list.