Santos (lat) will start a rehab assignment at Triple-A Tacoma on Tuesday, Shannon Drayer of SeattleSports.com reports.
Santos threw a live BP session Friday without a setback, paving the way for a minor-league rehab stint. Considering that he's been out since spring training, Santos should require several rehab appearances before being reinstated. It's unclear if he'll be able to return prior to the All-Star break.