General manager Justin Hollander said Friday that Santos (lat) will likely remain out until July, Daniel Kramer of MLB.com reports.

Santos (lat) recently upped his throwing distance to 120 feet, MLB.com reports.

The Mariners transferred Santos (lat) to the 60-day injured list Thursday.

Santos (lat) has progressed to throwing from 75 feet and could soon up his distance to 105 feet, SeattleSports.com reports.

Santos (lat) has started a throwing program and is getting closer to starting mound work, MLB.com reports. "I don't want to get into much more detail on timelines like that, but it has been very positive," manager Scott Servais said.

Santos (lat) played catch Monday after an MRI showed improvement, Shannon Drayer of Seattle Sports 710 AM reports.

The Mariners placed Santos (lat) on the 15-day injured list Thursday.

Santos (lat) will receive an MRI within the next few days, Ryan Divish of The Seattle Times reports.

Santos will not be ready for Opening Day after an MRI revealed a mild right lat strain, Shannon Drayer of Seattle Sports 710 AM reports.

Santos (lat) will long-toss from 150 feet Tuesday and might be cleared to throw off a mound in a few days, Ryan Divish of The Seattle Times reports.