Billy HeyenSat, November 29, 2025 at 2:26 PM UTC·2 min readMariners' next move could be to trade $24.15 million star originally appeared on The Sporting News. Add The Sporting News as a Preferred Source by clicking here.
The Seattle Mariners were so close to the World Series.
AdvertisementAdvertisementAdvertisementThey made it to Game 7 of the ALCS, and they held a late lead, before the Toronto Blue Jays broke their heart.
That has set up what is a big offseason.
Seattle already struck early, bringing Josh Naylor back on a five-year contract.
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The Mariners still have free agents Jorge Polanco and Eugenio Suarez lingering on the market if they have any interest in bringing them back.
Beyond that, there's a real case to be made that Seattle should pretty much just run it back.
But if the Mariners want to make another move, they've got a logical trade candidate: Luis Castillo.
AdvertisementAdvertisementAdvertisementMLB.com's Mark Feinsand made the case for trading Castillo in a new article.
"Let’s start by saying Castillo is unlikely to be traded, but if the Mariners look to make a big move, he will surely draw interest around the league," Feinsand writes. "He’s turning 33 next month, his $24.15 million salary is the highest on the roster, his no-trade clause recently expired, and with two years left on his deal (plus a vesting option for 2028), he could be a desirable asset to pitching-needy clubs that don’t want to make a long-term commitment. Castillo has posted an ERA of 3.64 or less in every season since 2019 and remains one of the most consistent starters out there."
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Feinsand says it right from the start that this isn't the most likely. The premise of his article had him naming a player from every team, and the Mariners are less likely to make a trade this offseason than some other teams.
AdvertisementAdvertisementAdvertisementBut it would be intriguing to see what Seattle could get for Castillo. If the Mariners could get a slightly younger piece to continue to build a formidable roster for years to come, there'd definitely be some appeal to that.
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