Ishikawa (back) has suffered a setback and is not expected to play any time soon, John Shea of the San Francisco Chronicle reports. Ishikawa had been scheduled to embark upon a rehab assignment for Triple-A Sacramento, but the Giants will hit the pause button on this plan, instead electing to keep him with the team for treatment. He's already eligible to return from the disabled list, but considering the lack of a concrete timetable, he may be out of action for quite a while longer. Ishikawa would have represented one of the final 25-man roster spots anyway, so is unlikely to hold much fantasy value down the stretch, even when healthy.