Japan's top flight are considering tinkering with the playing schedule for next season.
Officials from the J-League will work out whether it is best if they delay matches in summer to night-time kick-offs to avoid the heat and are also deciding if they should play all top flight matches on the same day so every team gets the same break in between games.
J-League chairman Kazumi Ohigashi said discussions were underway in regards to the proposed changes.
"Right now, we're discussing whether to extend the summer schedule next season where all matches kick off at night," he said. "This year, it ran from late June to late September, but we're thinking about adding a week or two next year.
"We're also debating whether to play all J1 games on Saturday, J2 on Sunday."
Ohigashi also said that the 'best team' rule needed to be looked at. At present, J-League clubs must field six players who have started at least once in the preceding five games but Ohigashi believes the controversial regulation is outdated and questions whether there is a need for it.
"I don't think there's any point in it," Ohigashi added. "The best team is the team that the coach picks. I personally think there's no need for it anymore."