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Santos was outrighted to Triple-A Sacramento on Monday.
This transaction will free up on a spot on the 40-man roster for Eric Cerantola, who was claimed by the Giants earlier in the day from the Royals. Santos owns a 6.89 ERA and 1.84 WHIP with an 11:11 K:BB across 15.2 innings this season for the River Cats.
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Giants' Gregory Santos: Activated from IL
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Santos (adductor) was reinstated from Triple-A Sacramento's 7-day injured list Wednesday, and he allowed three earned runs on two hits and three walks while striking out one over two-thirds of an inning in Friday's 13-6 win over Las Vegas.
Santos was placed on Sacramento's 7-day injured list May 26 due to a right adductor strain. He began a rehab assignment in the rookie-level Arizona Complex League on June 19 before returning to action with Sacramento and starting Friday's contest, during which he threw 16 of his 32 pitches for strikes. Over 13 appearances (one start) at Triple-A, the right-hander owns a 6.14 ERA, 1.83 WHIP and 11:10 K:BB across 14.2 innings.
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Giants' Gregory Santos: Begins rehab assignment
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Santos (adductor) allowed one earned run on two hits and one walk while striking out one over one inning during the ACL Giants' 7-4 loss to the ACL Athletics in the rookie-level Arizona Complex League on Friday.
Triple-A Sacramento placed Santos on its 7-day injured list May 26 with a right adductor strain, and he returned to action in Arizona. The 26-year-old right-hander gave up two singles while throwing 16 of his 20 pitches for strikes. He has spent most of the season at Triple-A, where he owns a 4.50 ERA, 1.50 WHIP and 10:7 K:BB across 14 innings in 12 appearances.
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Giants' Gregory Santos: On mend from adductor strain
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Triple-A Sacramento placed Santos on its 7-day injured list May 26 due to a right adductor strain, MLB.com reports.
Santos maintains a spot on the Giants' 40-man roster but has spent most of the season at Sacramento, with whom he's turned in a 4.50 ERA and 1.50 WHIP over 14 innings across 12 appearances. The righty reliever is projected to return to action for Sacramento in late June or early July.
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Giants' Gregory Santos: Returns to Triple-A
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The Giants optioned Santos to Triple-A Sacramento on Sunday.
The right-hander was called up by San Francisco in late April, but he'll return to Sacramento after giving up two earned runs with a 1:3 K:BB across three appearances and 5.2 innings. Santos could rejoin the Giants later in the season when bullpen depth is needed.
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Giants' Gregory Santos: Summoned from Triple-A
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The Giants selected Santos' contract from Triple-A Sacramento on Wednesday.
Santos will kick off his second stint in the majors with the Giants after previously breaking into the big leagues with San Francisco in 2021. He's bounced around between the White Sox and Mariners organizations since then before inking a minor-league deal with San Francisco over the winter. The 26-year-old righty reliever earned the promotion to the big leagues after logging a 2.45 ERA, 1.09 WHIP and 6:3 K:BB across 11 innings with Sacramento.
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Giants' Gregory Santos: Moved to minor-league camp
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The Giants sent Santos to minor-league camp Friday, Susan Slusser of the San Francisco Chronicle reports.
Santos received an invite to spring camp, but he'll fall short of making the big-league roster. The 25-year-old allowed five runs (two earned) with a 2:5 K:BB in 3.1 innings this spring.
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Giants' Gregory Santos: Issues two walks in spring debut
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Santos allowed two hits and two walks across one scoreless inning during Monday's 6-2 Cactus League win over the Athletics.
Santos surrendered a double, a single and two walks but was able to escape the third inning without allowing a run. A non-roster invitee to spring training, Santos signed a minor-league pact with San Francisco in mid-December after being non-tendered by the Mariners following a forgettable two-season stretch in which he made just 16 relief appearances while missing time due to right knee and arm issues. He'll look to earn a spot in the San Francisco bullpen and return to form after his injury problems.
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Giants' Gregory Santos: Signs with Giants as NRI
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Santos signed a minor-league contract with the Giants on Tuesday that includes an invitation to spring training, Francys Romero of BeisbolFR.com reports.
Santos first reached the majors with the Giants in 2021 before being traded to the White Sox three years ago. The 26-year-old had a tough time with injuries the past two seasons with the Mariners, making a total of only 16 appearances due to arm and knee problems. Santos is recovered from April arthroscopic right knee surgery and has a chance to win a spot in the Giants' bullpen.
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Gregory Santos: Gets non-tendered by Mariners
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The Mariners non-tendered Santos (knee) on Friday, Francys Romero of BeisbolFR.com reports.
Santos made just eight appearances for Seattle and six appearances on a rehab assignment in 2025 due to right knee surgery. He was pitching by the end of the season, so the reliever should be healthy heading into spring training, but the Mariners opted against tending him a contract. Santos appeared in only 16 games in two years in Seattle due to injuries.
Santos (knee) is slated to begin a minor-league rehab assignment with Triple-A Tacoma on Saturday, Shannon Drayer of SeattleSports.com reports.
Santos hasn't pitched with Seattle since April 15 but is aiming for a return to the Mariners at some point this month. The right-hander struggled to a 5.14 ERA and 2.29 WHIP across eight early-season appearances before getting hurt.
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Mariners' Gregory Santos: Aiming for mid-September return
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Santos (knee) is expected to begin a rehab assignment soon and is hopeful to return in mid-September, Adam Jude of The Seattle Times reports.
Santos has been sidelined since late April with a knee injury that required surgery. The 25-year-old is getting close to pitching in games, but he'll require a lengthy minor-league rehab assignment before being activated from the 60-day injured list. Santos has a 5.14 ERA in seven big-league innings this season.
Mariners general manager Justin Hollander said Monday that Santos (knee) threw three "light bullpens" last week, Circling Seattle Sports reports.
The hope is that Santos can return to the Mariners' bullpen before the end of July, but it's a rough timeline. Santos has been sidelined since late April with right knee inflammation and will need a rehab assignment before being activated from the 60-day injured list.
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Mariners' Gregory Santos: Transferred to 60-day IL
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Santos (knee) was transferred to the 60-day injured list by Seattle on Tuesday.
Santos is dealing with right knee inflammation. The Mariners needed his 40-man roster spot in order to select Samad Taylor's contract from Triple-A Tacoma.
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Mariners' Gregory Santos: Placed on injured list
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The Mariners placed Santos on the 15-day injured list Friday with right knee inflammation.
Santos was sent to Triple-A Tacoma on April 16 but is listed on the major-league injured list. He won't be eligible to return until May 10, and right now it's unclear if his knee will keep him out for more than the 15-day minimum.
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Mariners' Gregory Santos: Optioned to Triple-A
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The Mariners optioned Santos to Triple-A Tacoma on Wednesday, Daniel Kramer of MLB.com reports.
The Mariners had high hopes that a finally healthy Santos could be a weapon in their bullpen this season, but he has struggled mightily, posting a 5.14 ERA and ugly 0:8 K:BB over seven innings. Will Klein is absorbing his spot in the Seattle bullpen.
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Mariners' Gregory Santos: Healthy ahead of spring training
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Mariners president of baseball operations Jerry Dipoto said Monday that Santos has already reported to the team's spring training complex and has been throwing bullpen sessions, Ryan Divish of The Seattle Times reports.
Santos made only eight appearances for Seattle in 2024 due to multiple arm issues, but he finished the season healthy and will head into spring training without limitations. The 25-year-old can be a key member of the Mariners' bullpen if he can stay on the bump, but he's a major health risk.
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Mariners' Gregory Santos: Wraps '24 with scoreless efforts
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Santos, who was activated from the injured list last Monday, subsequently made two relief appearances during which he fired two scoreless innings while allowing one hit and recording one strikeout.
Santos got back on the bump at the major-league level for the first time since July 31 when he earned his second hold with a scoreless seventh inning in the series opener against the Athletics on Friday. He logged one more frame during Sunday's regular-season finale, getting through the eighth inning on just nine pitches. It was a modest but encouraging season-ending sample for Santos, who didn't make his 2024 debut until July due to a lat strain and then missed nearly two months with a biceps injury. The hard-throwing right-hander played on a one-year deal this season, and it remains to be seen if the Mariners will want to take another look considering Santos logged all of 7.1 innings across eight appearances due to the injuries.
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Mariners' Gregory Santos: Activated from IL
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The Mariners reinstated Santos (biceps) from the 15-day injured list Monday, Daniel Kramer of MLB.com reports.
Santos had been on the injured list since Aug. 2 due to right biceps inflammation. He began his rehab assignment with Triple-A Tacoma in early September, and across six outings he allowed one run on two hits and seven walks while striking out six across 5.1 frames. Santos has joined the Mariners in Houston and will operate out of the bullpen as Seattle makes a final push for a wild-card spot. To make room on the big-league roster for Santos, left-hander Jhonathan Diaz was optioned to the minors.
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Mariners' Gregory Santos: Two more scoreless rehab outings
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Santos (biceps) continued his rehab assignment with Triple-A Tacoma with one-inning scoreless appearances Wednesday and Saturday, allowing one hit and two walks while recording a strikeout over that span.
Santos has now logged 5.1 innings across six appearances with the Rainiers, allowing just one run on two hits but also posting a crooked 6:7 K:BB. While the spotty control is somewhat of a concern, Santos' arm appears primed for a return to the big-league bullpen as the Mariners make a push for a wild-card spot during the final week of the regular season.
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