Johnston is absent from the lineup for Friday's contest versus the Pirates.
It's the second straight game that the left-handed hitter has been out of the lineup against a righty hurler, which is curious given that he's slashing .350/.416/.483 against righties this season. Jake McCarthy and Tyler Freeman will occupy the corner outfield spots for the Rockies, and Sterlin Thompson will be the designated hitter while Johnston remains absent from the starting nine.