The Athletics have designated Jai Miller for assignment according to a team press release. This move and the earlier Landon Powell move get Oakland's 40-man roster back down to 40 players following the Gio Gonzalez trade.
Miller, 27 in January, hit .276/.368/.588 with 32 homers and 16 steals in 475 plate appearances for the Athletics' Triple-A affiliate this season. He's a .235/.288/.368 career hitter in 73 big league plate appearances spread across the last four years. Susan Slusser of The San Francisco Chronicle says (on Twitter) that Miller had mentioned as an outfield candidate next year, so the team must be hoping he clears waivers.