NEW YORK — A somber visitor’s clubhouse at Yankee Stadium was filled with Red Sox players and coaches hugging each other goodbye after a 4-0, season-ending loss to the Yankees in Game 3 of the Wild Card Series on Thursday. There was also an air of uncertainty about the future of Boston’s veteran core.

Shortstop Trevor Story and third baseman Alex Bregman — the two clear leaders of the club among position players — both have opt-out clauses in their contracts that would allow them to become free agents this winter. Neither veteran has committed to either returning or opting out. Bregman, who joined Boston on a heavily deferred three-year, $120 million contract in February, has two years and $80 million remaining on his deal (and an opt-out after 2026). Story has two years and $55 milli

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