Seiji Kobayashi hurt his left shoulder when he hit by a pitch during a game against the Rakuten Eagles at Tokyo Dome on June 16. He made the starting line-up against the Chiba Lotte Marines the following day, but then missed the next two games.
Kobayashi was examined at a hospital in Tokyo and diagnosed with a fracture in the infraspinatus fossa of the left scapula (left shoulder blade). He was taken off the active roster today.
[UPDATE 6/23 @ 10:32pm]
Kobayashi may not be able to return to the active roster until some time in August.
Source: Sponichi 6/23/2016
[UPDATE 6/24 @ 8:15pm]
Kobayashi will require about three weeks for a full recovery. He might be able to make it back to the active roster in late-July.
Source: Sponichi 6/24/2016