Gray (forearm) threw 10-12 pitches off a mound Sunday, the San Francisco Chronicle's Susan Slusser reports.
He will throw a bullpen session during Oakland's upcoming road trip, which starts Monday in Kansas City. There is a chance that Gray could return and pitch some innings for the A's before the end of the season, but it seems like a long shot for him to log enough quality innings to be of use in standard formats down the stretch, given where he's currently at in his rehab.