Sheffield (forearm) resumed throwing Friday, Shannon Drayer of 710 ESPN Seattle reports.

Sheffield has been on the injured list since July 8 with a left forearm strain. Manager Scott Servais previously said that the left-hander would be out well past the minimum 10 days, but Friday's update represents an important first step in his recovery. A clearer timeline will emerge when Sheffield is able to throw off a mound, but for the time being, an early-to-mid-August activation from the injured list appears to be within the realm of possibility.

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