The Cubs optioned Kilian to Triple-A Iowa on Tuesday, Meghan Montemurro of the Chicago Tribune reports.
Analysis: Kilian has surrendered 10 earned runs in just 5.1 innings of work this season at the major-league level. Michael Rucker will join Chicago's bullpen Tuesday in a corresponding roster move.
Caleb Kilian Promoted Sunday
Kilian was recalled from Triple-A Iowa on Sunday, Andy Martinez of Marquee Sports Network reports.
Analysis: The 26-year-old made a spot start for the Cubs in late April but was sent back to Triple-A after he surrendered seven runs across 3.1 innings. Kilian has continued to work as a starter at Iowa and has a 3.97 ERA over 88.1 innings, but he'll likely work out of the bullpen for Chicago.
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