NZ Rugby boss Steve Tew says there has been no agreement reached on the global season.

New Zealand Rugby boss Steve Tew has put the brakes on a proposal to scrap the southern hemisphere's hosting of June internationals in post World Cup years.

Reports from the BBC on Wednesday suggested changes to the international rugby calendar in 2020 would, among other things, see northern nations no longer trek south in years following World Cups, with a view to mitigating player welfare concerns and burnout.

The BBC report claimed this proposal was set to be ratified by World Rugby in November. Tew had a different view.

"We've got good conversations underway and we all know we need to make some changes. There is no perfect answer but the key thing is it won't be agreed until it is all agreed," Tew said.

"The issue with what they're proposing is it needs to be part of a package. I can't comment on specifics but we're not going to look at one part of a four-year programme for what could end up being six or 12 years. You've got to take the whole thing into account and there's a lot of moving parts.

"There is no agreement until we've agreed the whole package. Talking about one set of June internationals being dropped - and there is no agreement on that issue - is not helpful because it is just one part of a very complex conversation."

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The major missing piece of the puzzle from the BBC's report is how the current revenue sharing arrangements would alter - and how the south's shortfall would be made up.

As it stands, southern hemisphere nations retain all revenue from hosting three June internationals; the reverse true for November tests. This system is already a bugbear for some southern nations who feel they miss out on a large slice of the pie from cash-cow stadiums such as Twickenham.

Simply not having inbound June tours in years after World Cups could leave southern nations further out of pocket, unless some form of revenue sharing arrangement is agreed for the respective northern tours in November.

Hosting the likes of the Pacific Islands, Japan, USA or Canada in post World Cup years does not solve the current revenue sharing arrangement with the north.

By way of context, in World Cup years the 10 leading nations each receive around $18 million (NZD) in compensation from World Rugby for lost revenue from June and November internationals.

"It's well underway and there are some options being considered - some of them get aired in the media, some of them don't," Tew said. "I'll wait until we get to a point where we can explain the whole package because if you take bits it gets out of context and looks like there are bigger winners and losers than if you have the whole story."

Rugby bosses are set to tackle the divisive issue of a global season again in early October in Buenos Aires, with recommendations supposed to be delivered for the World Rugby meeting in November.

"That's the goal but I'm long past worrying about deadlines being arbitrarily set and not met."

The other major roadblock around aligning the seasons is the lucrative French Top 14 competition.

Ending domestic seasons in June, rather than internationals disrupting the flow of Super Rugby as it does now, appears a logical move. But multi-million French owners do not have the international game's best interests at heart and, therefore, are unlikely to make sacrifices.

Ultimately, this means talk of a "world club" competition to find the best of the best is premature.

"The French schedule is the most problematic. It might be that we end up having to agree a programme that the French either get involved in or don't because there is clearly a disjoint between the French clubs and the French Federation.

"The complications of different ownership models in various territories makes things difficult."