Miller (back) is expected to be activated from the 15-day injured list Saturday, Alex Pavlovic of NBC Sports Bay Area reports.
Miller has made two appearances with Triple-A Sacramento during his minor-league rehab assignment, combining to pitch two scoreless innings while striking out three batters. The southpaw will make his return to the major-league roster after the minimum 15 days on the injured list, and he should immediately be back in the mix for save chances with San Francisco.