Ken Griffey Jr. and Mike Piazza were unveiled Wednesday as the Hall of Fame's class of 2016.
Two other former Royals -- second baseman Mark Grudzielanek and catcher Jason Kendall -- also were first-timers on the ballot this year. Kendall received two votes while Grudzielanek received none, so neither will make the ballot again as well.
Both Sweeney -- special assistant to the general manager -- and Kendall, an assistant coach, remain in the Royals organization.
Sweeney was a dominant hitter with the Royals in his prime and still holds the club record for RBIs in a single season with 144 in 2000. From 1999-2005 he averaged 23 homers and 95 RBIs with a .313 average and .905 OPS.
Jeffrey Flanagan is a reporter for MLB.com. Follow him on Twitter at @FlannyMLB. This story was not subject to the approval of Major League Baseball or its clubs.