Masataka Yoshida was taken off the active roster today with pain in his lower back. Yoshida left a game against Lotte on April 23 early because of pain near his waist. This was not a recent develop: he had been playing through the pain for some time now.
[UPDATE 4/25 @ 7:17pm]
Yoshida was examined at a hospital in Kobe and diagnosed with lumbar disc disease. He will require about ten days before his first rehab game.
Source: Daily Sports 4/25/2016