Miller will be called up from Triple-A Round Rock prior to Tuesday's game against the Mariners, Kennedi Landry of MLB.com reports.
Miller has thrown three innings in the majors this season, allowing six runs in the process. Since he was most recently working as a member of Round Rock's rotation and covered five innings in his last outing Sept. 18, he could end up serving as a bulk reliever behind Jesus Tinoco, who is scheduled to serve as the Rangers' opening pitcher in Tuesday's game.