TOKYO — A gambling scandal has hit Japanese professional baseball at the worst possible time.

Just days before Japan’s version of the World Series begins and as baseball is vying to get back in the Olympics, the sport has been hit by an ugly incident involving the most popular team.

Nippon Professional Baseball announced on Wednesday that two more pitchers from the Yomiuri Giants had bet on professional baseball games.

The announcement follows revelations two weeks ago that Giants pitcher Satoshi Fukuda had bet on games involving his team as well as Major League Baseball. Fukuda did not appear for the top team this season, so there is no suspicion that he fixed games, but gambling is a violation of NPB’s charter.

Yomiuri president Hiroshi Kubo said pitchers Shoki Kasahara and Ryuya Matsumoto admitted to gambling on baseball, but have not been involved in any game-fixing.

“This is extremely regrettable,” NPB commissioner Katsuhiko Kumazaki said.