Keller and the Pirates won't play against the Brewers on Friday after the contest was postponed due to inclement weather, Todd Rosiak of the Milwaukee Journal Sentinel reports.
Friday's contest will be made up as part of a doubleheader Saturday. Right-hander Bryse Wilson will start the first game of the twin bill, while Keller will take the mound in the nightcap, Jason Mackey of the Pittsburgh Post-Gazette reports.