Demolishing the old National Olympic Stadium could have a negative impact on the 2019 Rugby World Cup and Tokyo 2020, Japan's former Prime Minister Yoshirō Mori, who is closely involved in both events, has warned.
The venue which hosted track and field events at the 1964 Olympic Games, was due to be knocked down last month to clear the way for a new 80,000-seat stadium.
But a fresh round of bidding for the project has been ordered following a complaint of irregularities in an earlier round this summer.
This has set back the commencement of proceedings until at least the middle of December, something Mori, the chairman of Tokyo 2020 and President of the Japan Rugby Football Union, is concerned about.
"I'm worried, the Olympics are for Tokyo, but we will have about 12 Rugby World Cup venues spread around the country," he told a meeting of city officials in charge of the Rugby World Cup.
"Because we'll open up all of Japan for everyone to see, we want the success of 2019 to carry over to the Tokyo Olympics."
Planning for the new Stadium, designed by award-winning British-Iraqi architect Zaha Hadid, has been plagued by problems, including complaints from some prominent architects, who say the futuristic design is too large and expensive.
The initial projected cost of 130 billion yen (£808 million/$1.3 billion/€1 billion) had ballooned to more than double that, although it is expected to be scaled down.
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October 2014: "Basic mistakes" on bidding delay demolition of Tokyo's old Olympic Stadium
July 2014: Protests held as opposition builds against new National Stadium in Tokyo
May 2014: Tokyo says sayonara to National Stadium as row over redesign continues
May 2014: Downscaled design approved for Tokyo 2020 Stadium