Spencer Turnbull is unlikely to make it back to the Detroit Tigers this season.

The right-hander has spent the entire season on the injured list while rehabbing from Tommy John surgery.

Turnbull hasn't experienced any setbacks, but the Tigers would need an "aggressive" timeline to get him back on the mound for a couple late-September starts, A.J. Hinch told reporters.

The 29-year-old had a 2.88 ERA in nine starts for Detroit last season before he got injured.