Placido Polanco (back) will begin his minor league rehab assignment with High-A Clearwater on Thursday. It was previously reported that Polanco would begin a rehab stint Wednesday, but there was apparently a change of plans. The 36-year-old expects to be the everyday third baseman upon his return even though Phillies manager Charlie Manuel said otherwise on Monday. Either way, he doesn't figure to be relevant in mixed leagues down the stretch.