Travis Ishikawa, who is on a rehab assignment for a back injury, could return as early as Monday.
Pirates claimed Travis Ishikawa off waivers from the Giants.
Ishikawa had a setback with his sore back, Bochy said. Will need more time.
Giants sign Travis Ishikawa to one-year, $1.1 million contract, said his agent, Jim McDowell. Ishikawa thus avoids salary arbitration.
While Travis Ishikawa has been claimed on waivers by the Yankees, their current first baseman, Lyle Overbay is 5-for-7 this series.