Alexander was optioned to Triple-A Omaha on Monday, Rustin Dodd of The Kansas City Star reports.
Alexander has pitched well this spring (1.93 ERA and 0.86 WHIP across 9.1 innings), but with Mike Minor and Travis Wood representing the top two left-handed options in the bullpen, the 27-year-old will have to start his season in Omaha and work for a call-up. He saw some time with the Royals last season, and he should see another opportunity in the big leagues sometime in 2017.