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Whisenhunt (back) will throw a bullpen session Monday, Shayna Rubin of the San Francisco Chronicle reports.

It appears to be the first time Whisenhunt has thrown from the bump since he landed on the 15-day injured list at the end of August with a back strain. Whisenhunt is eligible for activation this weekend, and it's possible he'll return then if the Giants don't think he needs a rehab start.

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