Hale was one of five finalists for the Mariners' managerial job, ultimately given to Lloyd McClendon last week. He also interviewed with Seattle in 2008, when the Mariners hired former A's coach Don Wakamatsu, and has been a contender for several other openings in recent years.
But Hale will remain in Oakland with longtime friend and A's manager Bob Melvin, with whom he also worked in Arizona, to fulfill the final year of his contract.
Melvin told MLB.com on Tuesday that he plans to bring back all of his other coaches, including pitching coach Curt Young and hitting coach Chili Davis, who has also been speculated as a future manager.
Also expected back are first-base coach Tye Waller, third-base coach Mike Gallego and bullpen coach Darren Bush.
Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. This story was not subject to the approval of Major League Baseball or its clubs.