The Mariners outrighted Watson to Triple-A Tacoma on Monday.
Watson was a waiver claim of the Mariners back in August, but the righty has yet to make his major-league debut. He's no longer on the 40-man roster but will remain in the organization.
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Mariners' Josh Simpson: Sent outright to Triple-A
Rotowire
The Mariners outrighted Simpson to Triple-A Tacoma on Monday.
Simpson has logged a 7.82 ERA but has 46 strikeouts in 38 innings during his time in the big leagues. He's no longer on the Mariners' 40-man roster.
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Mariners' Patrick Wisdom: Outrighted to Triple-A
Rotowire
The Mariners outrighted Wisdom to Triple-A Tacoma on Monday.
Wisdom will exit the 40-man roster heading into the offseason and is likely to become a free agent. The 35-year-old went 5-for-47 with a 3:21 BB:K in 19 contests during his time with the Mariners this season.
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Mariners' Will Wilson: Booted from 40-man roster
Rotowire
The Mariners outrighted Wilson to Triple-A Tacoma on Monday, Ryan Divish of The Seattle Times reports.
The 28-year-old appeared in just two games for the Mariners last season and played in just 19 minor-league contests, slashing .304/.403/.429 between High-A Everett and Triple-A Tacoma. He suffered a broken left thumb in early May and missed the remainder of the 2026 campaign.
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Mariners' Weston Wilson: Outrighted to Triple-A
Rotowire
The Mariners outrighted Wilson to Triple-A Tacoma on Monday, Ryan Divish of The Seattle Times reports.
Wilson was removed from the 40-man roster after appearing in 54 games for the Mariners last season. He slashed an ugly .192/.263/.296 with three home runs, 11 RBI, 18 runs scored, five stolen bases and a 12:47 BB:K across 136 trips to the plate with Seattle.
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Mariners' Isaac Mattson: Claimed off waivers by Seattle
Rotowire
The Mariners claimed Mattson off waivers from the Pirates on Monday, Colin Beazley of the Pittsburgh Post-Gazette reports.
Mattson posted a 2.45 ERA and 45:19 K:BB over 47.2 innings in 2025, but he stumbled in 2026 with a 5.35 ERA and 36:18 K:BB over 38.2 frames. The 31-year-old will look to fill a middle relief role in Seattle.
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Mariners' Michael Arroyo: Undergoes elbow surgery
Rotowire
Arroyo underwent right elbow surgery Wednesday to clean up cartilage and brace a chronic injury to his UCL.
The Mariners expect Arroyo to be ready to play in games again by next April, so he's slated to get a late start to next season. Arroyo was impressive down the stretch for the Mariners after being summoned for his major-league debut in September, going 13-for-35 (.371) with one home run, two steals and a 5:6 BB:K. It's unclear whether Arroyo will be able to play the field right away upon his return, or if the Mariners could limit him to designated hitter initially.
The Mariners claimed McCray off waivers from the Giants on Thursday, Susan Slusser of the San Francisco Chronicle reports.
McCray logged just 11 hits in 77 MLB at-bats this season, but the Mariners will take a flier on him and add him to their 40-man roster to begin the offseason. The 25-year-old outfielder posted a .708 OPS in 244 plate appearances at Triple-A in 2026 and will likely spend most of next season in the minors as well.
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Mariners' Bryce Miller: Still with Seattle after declined option
Rotowire
The Mariners declined Miller's $6.075 million club option for 2027 on Thursday.
Miller remains under team control through 2029, but the Mariners expect to be able to lock him in at a cheaper cost for 2027 via the arbitration process. The 28-year-old right-hander had an up-and-down 2026 campaign, finishing with a 4.17 ERA, 1.16 WHIP and 119:38 K:BB across 118.2 innings.
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Mariners' Andres Munoz: Club option for 2027 exercised
Rotowire
The Mariners exercised Munoz's $9 million club option for 2027 on Thursday.
Munoz had a disappointing 2026 season by his standards, posting a 4.24 ERA, 1.22 WHIP and 89:24 K:BB over 57.1 innings. However, he's still a bargain at that price, and the Mariners will have another club option on Munoz for 2028. Munoz boasts a career 34.4 percent strikeout rate, and he'll be in line to serve as closer for Seattle again in 2027.
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