Any changes to venues for Tokyo 2020 will only be allowed to be made with the full support of the sport's world governing bodies, International Olympic Committee (IOC) vice-president John Coates warned here today.
Earlier this month, Tokyo's new Governor Yoichi Masuzoe launched a review over venue plans due to concerns over costs, mainly linked to construction and labour.
But Coates, chairman of the IOC's Coordination Commission for Tokyo 2020, which today concluded its first three-day tour since the Japanese capital was awarded the Games last September ahead of rivals Istanbul and Madrid, made it clear that they would have to fully consult the International Federations before they could make any revisions.
One of the plans to be reviewed is construction of a canoe slalom course in Kasai Rinkai Park, built on reclaimed land and the focus of widespread opposition from local environmental groups.
Basketball and badminton could also be affected by the review and moved to existing facilities well outside the eight-kilometre ring instead of venues to be built on a waterfront area near the Olympic Village.
There is also opposition to a proposed Zaha Hadid redesigned National Stadium, the main centre of the 1964 Olympics, which critics claim is too big, too expensive and would ruin the city's skyline.
"The only sport with which we have spoken about with any specificity is canoe slalom," said Coates at the closing press conference.
"The discussion there arose from our first project review and visit when we were obviously aware from the Evaluation Commission of opposition to the proposed site, both on an environmental basis and because a lot of citizens of this city use that part of the island for recreation.
"Our advice was, 'Well, if there is that amount of opposition, look for another site'.
"They located another site on the same island and we have recommended that there be discussions with the International Canoe Federation as to the exact design, but also what they want to do with it afterwards."
Coates claimed this was in line with the IOC's determination not to see cities be left with white elephants after hosting the Games.
"This is consistent with President [Thomas] Bach's 2020 Working Agenda that we want to see venues that our sustainability and have legacy," he said.
"We want to see the use of more existing venues.
"We want to see the use of more temporary venues."
Coates warned, though, that the process could not be open-ended and set a deadline of the end of this year.
"We would like to see this done as soon as possible and we would like to know where we are going on the venues," he said.
"Whether they are temporary or permanent venues they are all in the mix.
"But there will be no changes unless there is the full sign-off from the International Federations - that is critical."
Rio 2016 has faced criticism from several governing bodies for revising its original plans presented during its successful bid and then failing to consult them properly.
"In the [IOC] Evaluation Commission report we identified that would be an opportunity to further improve on the plans presented," said Coates.
"One of the reasons Tokyo was so successful was the appreciation of one Village for all of the athletes and the general compactness of the Games."
Tokyo 2020 President Yoshirō Mori promised they would heed Coates' advice.
"With regard to the review of our venue plan, I informed the Coordination
Commission that, based on such aspects as the kind of legacy we will leave, the impact of
the Games on the lives of Tokyo residents, and the cost of construction and maintenance
of the venues," he said.
"The Organising Committee will examine all issues closely and collaborate
with the International Olympic Committee, the International Paralympic Committee, and
both domestic and international sports federations to ensure the success of the Games."
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May 2014: Second petition launched against "too big and too expensive" Zaha Hadid-designed Tokyo 2020 stadium