Olson, 29, heads to East Asia after spending parts of each of the last six seasons in the Majors with the Orioles, Mariners, Pirates and Mets. He is 14-22 with a 6.26 ERA in 104 career appearances, many of which came in 2008, when he made 26 starts with the Orioles. He pitched in just five big league games, all in relief, over the last two seasons.
With Olson out of the mix, the A's have 45 players in camp, including 13 relievers.
Jane Lee is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.