Griffin has been diagnosed with a torn tendon in his left ring finger and could be sidelined for at least a month, Jeff Passan of ESPN.com reports.
Griffin injured the finger while making a diving catch during Sunday's game against the Nationals. He remained in the contest to take two more plate appearances, striking out in one and delivering a two-run single in the other. Passan notes Griffin could opt to play through the injury, but the most likely option is to rehab it, which would shelve the shortstop for at least a month. If an absence is required, Griffin could spend about six weeks in a splint and be out until September, per Jonathan Mayo of MLB.com. The Pirates should have more information on Griffin's status prior to Tuesday's contest against Atlanta.