Here we will endeavor to track every move the Mariners make during the 2025-2026 off-season, with links to further coverage if warranted.
November 4: Mariners exercise club option on closer Andrés Muñoz. Mariners decline mutual option on catcher Mitch Garver, who is now a free agent along with Josh Naylor, Eugenio Suárez, Luke Jackson and Caleb Ferguson.
November 5: INF Jorge Polanco declines his player option and is now a free agent. Mariners re-instate INF Ryan Bliss, RHP Trent Thornton, and RHP Gregory Santos from the IL.