Okamoto, a 29-year-old third baseman and first baseman, hit .327 with 15 homers and 49 RBIs in 69 games last year for the Central League’s Yomiuri Giants. He injured his left elbow while trying to catch a throw at first base on May 6 when he collided with the Hanshin Tigers’ Takumu Nakano, an injury that sidelined Okamoto until Aug. 16.