McClanahan (back) was activated off the 10-day injured list to start Sunday's game versus Detroit, Neil Solondz of the Rays Radio Network reports.
The left-hander will rejoin the rotation after spending the 10-day minimum on the IL due to back stiffness. McClanahan has a 3.04 ERA, 1.33 WHIP and 57:13 K:BB across 50.1 innings (nine starts) since the All-Star break, and he shouldn't significant workload limitations Sunday following the brief absence.