Rakuten Eagles' manager Senichi Hoshino (67) was examined at a hospital on Monday. The Eagles announced today that Hoshino was diagnosed with a herniated lumbar disc and ossification of the yellow ligament in his thoracic spine.
Hoshino missed Monday's game against the Yakult Swallows. There is a good chance he will miss more of the season as he considers various treatments, including surgery. Pitching coach Yoshinori Sato will continue to act as interim manager in his absence.
Source: Nikkan Sports 5/27/2014