Ibanez wasn't included on the roster submitted Thursday before the series opener against the Los Angeles Angels. The 42-year-old began this season with the Angels, who released him in June.
Los Angeles chose reliever Vinny Pestano over Joe Thatcher, who hasn't pitched well since his return from a sprained left ankle. The Angels also left off left-hander Wade LeBlanc and 40-year-old infielder John McDonald.
Versatile Efren Navarro earned a spot as an Angels reserve.
The Angels kept 12 pitchers on their roster, while the Royals have 11.