Turnbull (lat) will begin a rehab assignment with Triple-A Lehigh Valley on Sunday.
Sidelined since late June with a right lat strain, Turnbull is finally ready to return to a live setting. He'll be cutting it close, but it appears he'll get a chance to bolster his case for a postseason roster spot with an appearance or two during the final week of the regular season. Turnbull has posted a stellar 2.65 ERA and 1.05 WHIP in 54.1 innings with Philadelphia this season.