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The English Rugby Football Union are not in favour of moving the Six Nations Championship from its traditional February-March slot.
New World Rugby chairman Bill Beaumont is keen to create a global calendar and has intimated that the Six Nations could be moved to a later point in the year.
RFU chief executive Ian Ritchie, however, is against altering the international season and has warned the RFU would oppose any changes.
"The Six Nations, as far as the date in the calendar is concerned, works well," Ritchie told BBC Radio 4.
"As far as we're concerned we have a great TV deal and we have stadia that are filled for every game. Why would you want to change something that works really well? So I can't see there being any significant move in that.
"And I think as well that the autumn internationals work terribly well for us as well. It's early days yet, but it's going to be an interesting few months on the global calendar discussions."
The international calendar is full until the 2019 Rugby World Cup and officials are due to meet in the coming months to discuss proposed changes to the schedule.
"There have been a number of preliminary discussions about the global season. We've obviously had some talks about how we see the English situation and it's early days," Ritchie added.
"It's a priority moving on. You've always got to have some elements of flexibility in an eight-year deal."