Hurter was pulled off his initial rehab assignment to work on mechanics after he allowed 11 runs (10 earned) in his first 3.2 innings. The lefty has been out since late May with lumbar spine inflammation, and a timeline for his activation will depend on how he looks and feels in the coming days with Toledo.

Hurter isn't dealing with any new injury complications, but the Tigers will pull him away from minor-league games anyway for about a week so that he can work out some issues with his delivery. The left-hander hasn't found much success since he was cleared to play in rehab games Aug. 5, allowing 11 runs (10 earned) on 11 hits and four walks while striking out four batters in just 3.2 innings.