Tokyo's scandal-tinged Olympic stadium will be completed in time for the 2020 games, the city's governor said Wednesday, as London mayor Boris Johnson warned of the pitfalls of "playing politics" when hosting the competition.

Japan's preparations for the global games suffered a humiliating setback this summer when the government pulled the plug on its flagship stadium following spiralling costs and complaints over the design.

Organisers have instead opted for a cheaper alternative stadium which must now be rushed to be completed in time.

"Cooperating with the national government... we will do everything we can so that we will complete construction of a new national stadium by January 2020," Tokyo governor Yoichi Masuzoe told reporters Wednesday.

He added that the six new venues being built for the games were all "proceeding on schedule".

Masuzoe also welcomed London's famously eccentric mayor Johnson, who won an election shortly before that city hosted the 2012 Olympics.

Those games were held at a fraction of the cost of Beijing's four years earlier and came in significantly under budget -- a rarity in the notoriously spendthrift world of Olympic hosting.

At the time it was cancelled, Tokyo's stadium -- designed by British architect Zaha Hadid -- was on track to become the world's most expensive with a $2.0 billion price tag.
Asked by reporters what the key to London's success was, Johnson said it was competent communication among all government and city departments involved in preparing the games.

"And that was the case all across all party lines. There was nobody who tried to make politics... that was I think very, very important for our success," he said.

Tokyo's stadium fiasco has pushed back a new venue's completion date, embarrassing Japanese sport officials who have also been forced to find an alternate showpiece site for Rugby World Cup matches in 2019.

Some have expressed concerns about Tokyo hosting the games in the summer, when the city often experiences intense heat.

But Masuzoe said he was confident authorities could keep athletes and spectators cool by "spraying mist, holding a marathon race very early in the morning or paving roads with heat-absorbing technologies."

The governor's meeting with Johnson came as officials from the International Olympic Committee reviewed the ongoing preparations for the games and said they had confidence in the plans.

At a press conference IOC Vice President John Coates said Japanese organisers had helped "build up the excitement around the world".

Source: AFP