In recent seasons, being a Seattle Mariners fan has often meant bracing for the unexpected — particularly when it comes to trades. One moment, everything seems stable, and the next, a fan favorite like Kendall Graveman, Paul Sewald, or Eugenio Suárez is suddenly on the move.
That unpredictability naturally raises the question: who might be next as the 2025-26 MLB offseason gets underway? While it’s possible that no major trades occur, president of baseball operations Jerry Dipoto has never shied away from exploring opportunities, and it’s almost certain he’ll at least test the waters again this winter.
With that in mind, here are four Mariners players who fans would hate to see go — but who could realistically be moved if the right offer comes along. They’re listed from least to most surprising if traded.
RHP Luis Castillo
Luis Castillo rebounded in 2025 with a slightly stronger campaign than the year before, tossing 5.1 more innings and trimming his ERA from 3.64 to 3.54. When he’s on, he remains a true top-of-the-rotation arm, and his $24.15 million salaries for 2026 and 2027 look reasonable if he maintains that level.
However, at 32 years old, Castillo’s declining velocity and strikeout rate suggest the wear and tear is starting to show. Seattle reportedly listened to trade offers for him last offseason and could do so again — especially since moving his salary would free up resources for other needs.
With potential holes in the lineup looming — particularly if Jorge Polanco opts out and Josh Naylor and Eugenio Suárez head to free agency — the Mariners might need that financial flexibility more than ever. While Castillo has a no-trade clause, both sides could see value in a deal that helps the team reload.
C Harry Ford
Harry Ford has been a popular name in trade rumors for the past year, though he ultimately remained with the team and even made a brief big-league appearance in September, earning a spot on the playoff roster.
Despite that, his long-term fit remains uncertain. With Mitch Garver likely departing, Ford could slide in as Cal Raleigh’s backup — but that role may not maximize the potential of a 22-year-old top prospect ranked No. 42 by MLB Pipeline.
If the Mariners are looking to upgrade their offense, Ford could be one of their best trade assets. Packaging him in a deal for a middle-of-the-order bat might make more sense than having him play a limited role behind Raleigh.
LF Randy Arozarena
The trade for Randy Arozarena in 2024 has to be considered one of Dipoto’s biggest wins. In 214 games with Seattle, Arozarena has hit 32 home runs, stolen 35 bases, and earned an All-Star nod in 2025.
But the financial picture complicates things. According to Steve Adams of MLB Trade Rumors, Arozarena’s salary will jump from $11.3 million in 2025 to $18.2 million in 2026 through arbitration — which would make him the team’s third-highest-paid player behind Castillo and Julio Rodríguez.
Given his streaky bat and inconsistency in the field, Seattle may decide that kind of money could be better spent elsewhere. Trading Arozarena now could help fill multiple roster gaps while his value remains strong.
RHP Logan Gilbert
It might sound shocking, but a Logan Gilbert trade isn’t completely out of the question. Earlier this year, Gilbert looked like a prime candidate for a contract extension alongside Rodríguez and Raleigh. Now, his future in Seattle is a bit murkier.
The 28-year-old is under team control through 2027, but he’s coming off an uneven year in which a forearm strain cost him time and allowed Bryan Woo to emerge as the rotation’s new ace. While Gilbert remains a front-line starter, Seattle’s rotation depth — including Woo, George Kirby, and Bryce Miller — gives Dipoto leverage if he wants to deal from a position of strength.
Given that Kirby and Miller had down years that hurt their trade value, Gilbert may be the most attractive arm for rival teams. If the Mariners want to add a true impact hitter, he could be the centerpiece of a blockbuster deal that continues Dipoto’s trend of bold, and sometimes controversial, moves.