The A's coaching staff could look much different next season.

A source told NBC Sports Bay Area's Alex Pavlovic that quality control coach Mark Kotsay interviewed for the Giants' managerial opening, the San Francisco Chronicle's Susan Slusser reported Monday that bench coach Ryan Christenson is a candidate for the Pittsburgh Pirates and third base coach Matt Williams has a new job lined up.

Williams confirmed to NBC Sports California's Ben Ross in a text message that he will manage the Kia Tigers in Korea's KBO next season. MLB Network's Jon Heyman first reported the news, and Slusser was the first to confirm Heyman's report.

The A's hired Williams in November 2017. He previously managed the Washington Nationals from 2014 through 2015, winning National League Manager of the Year in his first season in Washington's dugout. The 17-year MLB veteran compiled a 179-145 record as a manager, but Williams was fired by the Nationals after his second season with the team. Williams, who played for the Giants for 10 seasons, covered San Francisco as a studio analyst for NBC Sports Bay Area in 2017 after serving as the Arizona Diamondbacks' third base coach in 2016.

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Oakland made the playoffs in both of Williams' seasons as third base coach, losing in the AL Wild Card Game each time. 2018 and 2019 marked just the fifth time the A's qualified for the playoffs in consecutive seasons since moving to Oakland.

If the A's are going to play in the postseason again next October, they're likely to have some new faces in the dugout and in the third-base box.