Tatsuya Oishi was taken off the active roster today with neck pain. He started complaining about the pain yesterday. The Seibu Lions decided to take him off the active roster because they feel it will take more then two or three days for the pain to go away.
Source: Sports Hochi 5/3/2017
[UPDATE 6/2 @ 11:43am]
Oishi could make his first rehab appearance during a three-game series against Ni-gun Yomiuri that begins on June 6.
Source: Sports Hochi 6/2/2017