Arroyo will begin transitioning from second base to left field this month during the Columbian Winter League, Adam Jude of the Seattle Times reports.
Arroyo played second base exclusively in 2025 between High-A Everett and Double-A Arkansas, slashing .262/.401/.433 with 17 homers and 12 steals between the two stops. He has never played the outfield before, but with the Mariners' infield depth, the organization has elected to move the 21-year-old to left field. Arroyo could push to debut at some point during the 2026 season.
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Mariners' Cole Young: Leading candidate for second base
Rotowire
Young is the leading candidate to start at second base for the Mariners next season, Adam Jude of the Seattle Times reports.
Young's playing time tapered off for the Mariners down the stretch of the regular season and he did not play during the playoffs. However, Seattle remains high on the 22-year-old's potential despite a .211/.302/.305 batting line in 77 games this season. The Mariners could acquire a second baseman from outside the organization, but if they don't, the left-handed-hitting Young is the top candidate to start at least against righties. Leo Rivas and Ryan Bliss (knee) will also be in the mix.
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Mariners' Casey Lawrence: Back in Seattle on MiLB deal
Rotowire
The Mariners re-signed Lawrence to a minor-league contract Thursday, Aram Leighton of JustBaseball.com reports.
Lawrence appeared in six games between the Blue Jays and Mariners last season, holding a 4.08 ERA and 7:1 K:BB over 17.2 frames. The 38-year-old right-hander will likely begin the 2026 season at Triple-A Tacoma as swingman depth.
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Mariners' Tayler Saucedo: Removed from 40-man
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The Mariners designated Saucedo for assignment Tuesday, Daniel Kramer of MLB.com reports.
The 32-year-old lefty will end up as the roster casualty necessary to make room for Alex Hoppe, who was acquired Tuesday in a trade with the Red Sox. Saucedo struggled to get going in 2025, turning in a 7.43 ERA and 1.88 WHIP across 13.1 innings with the Mariners. He posted a 2.75 ERA in 19.2 frames at Triple-A Tacoma, however, which may be enough for another team to put in a waiver claim on him.
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Mariners' Alex Hoppe: Sent to Seattle
Rotowire
The Red Sox traded Hoppe to the Mariners on Tuesday in exchange for minor-league catcher Luke Heyman, Chris Cotillo of MassLive.com reports.
Hoppe spent time with Double-A Portland and Triple-A Worcester in 2025, logging a 4.55 ERA and 1.52 WHIP over 61.1 innings between the two levels. Now with the Mariners, Hoppe will claim a 40-man roster spot and presumably begin the 2026 season at Triple-A Tacoma, where he will be tested in the hitter-friendly Pacific Coast League. Tayler Saucedo was designated for assignment in a corresponding move.
Ortiz was traded from the Dodgers to the Mariners in exchange for minor-league pitcher Tyler Gough (elbow) on Sunday, Fabian Ardaya of The Athletic reports.
Ortiz was just added to Los Angeles' 40-man roster Nov. 6, but he will now head to the Mariners organization. The left-hander began the 2025 campaign with Single-A Rancho Cucamonga, but he was able to work his way all the way up to Triple-A Oklahoma City, posting a 2.76 ERA with 14 strikeouts over 15 appearances, including one start, with OKC. Ortiz will look to compete for a spot in the major-league bullpen when Seattle regroups at spring training in February.
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Mariners' Josh Naylor: Sticking with Seattle
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Naylor and the Mariners are finalizing a five-year contract Sunday, pending a physical, Jeff Passan of ESPN.com reports.
Naylor will remain with Seattle after being traded to the team from Arizona in late July. The first baseman compiled a .295/.353/.462 slash line while producing 20 home runs, 92 RBI, 81 runs scored and a career-high 30 stolen bases over 147 regular-season contests with the Diamondbacks and Mariners in 2025. Naylor registered a .299 average with nine homers and 33 RBI in 54 regular-season games with Seattle. The 28-year-old will now hold down the first-base position for the team for a half-decade moving forward.
Mariners' Randy Dobnak: Gets NRI pact from Seattle
Rotowire
The Mariners signed Dobnak to a minor-league contract with an invitation to spring training Tuesday, Jeff Passan of ESPN.com reports.
Dobnak became a free agent last week after the Tigers declined his option for 2026, and he's now headed to the Pacific Northwest. The 30-year-old spent nearly all of 2025 at the Triple-A level, holding a 5.84 ERA over 18 starts and eight relief appearances. Dobnak will likely begin the 2026 season in the rotation at Triple-A Tacoma.
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Mariners' Ryan Loutos: Claimed by Mariners
Rotowire
The Mariners claimed Loutos off waivers from the Washington Nationals on Thursday.
Loutos, a 26-year-old right-hander, made 12 MLB appearances during the 2025 season, split between stints with the Dodgers and Nationals. He posted a 12.75 ERA and a 2.33 WHIP with an 8:8 K:BB over 12 innings. He fared significantly better with the Nationals' Triple-A affiliate in Rochester, posting a 4.32 ERA and a 27:13 K:BB across 25 innings. He'll join the Mariners' 40-man roster.
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