Hisashi Iwakuma experienced discomfort in his shoulder following a bullpen session and has been shut down. He's out indefinitely at this point. (Bob Dutton on Twitter)
Fantasy Impact
Iwakuma was a fantasy relevant pitcher, but he's lost velocity and effectiveness of late. He entered the DL with an ERA and WHIP of 4.35 and 1.26. Considering the setback, he's safe to drop in most formats.