Miller (back) threw a bullpen session Wednesday and could return to action as soon as next week, Maria Guardado of MLB.com reports.
Miller has yet to make his Cactus League debut this spring due to lower-back tightness, though he's progressing toward a return. The southpaw will aim to start the season at full strength after his 2025 campaign was cut short due to a left elbow injury. Over 36 relief appearances last season, Miller posted a 1.50 ERA, 1.47 WHIP and 22:20 K:BB in 30 innings.