Japanese baseball commissioner Yasuchika Negoro said Thursday he prioritizes maintaining the two-league system in the debate over whether to realign Japanese professional baseball.

News photoHanshin Tigers' Takashi Toritani steals second base during the fifth inning of Friday's game against the Hiroshima Carp at Koshien Stadium.

"We have had two leagues for 55 years of the 70-year history of Japanese baseball. We have to consider first if we could keep them and if we find it hard to do it, there may be an opinion in favor of a switch to one league," Negoro said.