Miller (abdomen) is scheduled to take batting practice against Brad Boxberger (back) next week and also play in extended spring training games, Roger Mooney of the Tampa Bay Times reports.
Miller has progressively been ramping up his activity this week, and has progressed to the point where he'll be ready to handle live pitching. The infielder remains without a firm timetable for return, but the extent of his expected participation next week should be a solid barometer of where he stands in his rehab.