Munoz (shoulder) will begin a rehab assignment with Triple-A Tacoma on Tuesday, Ryan Divish of The Seattle Times reports.
Munoz was shut down for a bit following a setback with his right shoulder, but he's been throwing without issue of late and is ready to test himself in a game setting. The Mariners will begin a road trip that begins Friday and runs through June 11, and if all goes well during his time in the minors, the fireballing reliever could be activated from the 15-day injured list at some point during that trip.