The Royals outrighted Lange to Triple-A Omaha on Thursday.
Lange ranked second on the Royals with 10 saves this season, but he finished with an unsightly 6.75 ERA, 1.63 WHIP and 60:33 K:BB over 60 innings. The 31-year-old will remain in the organization for the time being, but he's a non-tender candidate.