Turnbull (neck) is on track to begin a throwing program next week, Chris McCosky of The Detroit News reports.
Turnbull has been limited to strength and conditioning work since he went on the major-league IL in early May due to a neck injury, but he's about ready to take a big step. The 30-year-old right-hander had originally been optioned to Triple-A Toledo before the injury was revealed, so he might be in for a lengthy minor-league rehab stint.