Belt received a cortisone shot and had his knee drained Sunday, Susan Slusser of the San Francisco Chronicle reports.
Belt was unavailable for the Giants' weekend series against the Padres and has landed on the injured list for the second time this season. However, he's optimistic that he'll be able to return after spending the minimum of 10 days on the IL. Darin Ruf and Wilmer Flores should see additional time at first base while Belt is sidelined.