Plouffe is not in the lineup Tuesday against the Marlins, Susan Slusser of the San Francisco Chronicle reports.
With Oakland playing in a National League park, there's no designated hitter spot to allow both Ryon Healy and Plouffe to be in the lineup. Healy will get the nod at the hot corner Tuesday, and Plouffe could see his playing time dwindle when they return to American League play given his poor .217 batting average on the season.