The Cubs optioned Palencia to Triple-A Iowa on Saturday, Meghan Montemurro of the Chicago Tribune reports.
Palencia will end up as the Cubs' roster casualty as Shawn Armstrong, who was claimed off waivers from St. Louis on Friday, officially joins the active roster Saturday. Palencia appeared in two games for Chicago during his latest big-league stint, allowing two runs over 1.2 innings while striking out two batters and issuing four walks.