The A's signed Nakajima to a two-year contract in the offseason after he left Japan to play for Oakland.
Nakajima batted .311 with 13 homers in 136 games last season for the Seibu Lions.
AJ Cassavell is a reporter for MLB.com. Follow him on Twitter @ajcassavell. This story was not subject to the approval of Major League Baseball or its clubs.