Presentations will be made by delegations from each city to the voting FINA Bureau at a closed meeting tomorrow morning before a decision is made and revealed thereafter.

It is possible, however, that a host for the 2025 Championships could also be selected, despite this having not been announced beforehand or put on the agenda.

This would ensure the three events would be split between the three Asian candidates. 

"They are fantastic bids and we'll see," FINA executive director Cornel Marculescu told insidethegames today.

"If we can give one, or two, or three events, who knows?

"Generally, we give more than one event because we think, when we consider their efforts to create the bid...

"Financially, emotionally and professionally.

"To come to a selection and have people disappointed is not a good thing, and to have longer planning time is better for everybody.

"So we prefer to award two or possibly three World Championships.

"But we don't know yet [about 2025] - it depends on the bidders and what they want to do."

insidethegames understands that this is not a formality and there may be some opposition to this proposal, but that it will certainly be considered.

Representatives from all three candidates were here this evening, taking the opportunity to meet FINA top brass at a special dinner attended by FINA President Julio Maglione.

Fukuoka, Japan's sixth largest city around 1,000 kilometres to the south-west of Tokyo, also hosted the 2001 World Aquatics Championships.

Doha hosted the 2014 World Short-Course Swimming Championships, while Nanjing is best known in a sporting sense as host of the 2014 Summer Youth Olympic Games.

Shanghai in China hosted the 2011 World Aquatics Championships while Hangzhou is due to host the 2018 World Short-Course Swimming Championships, although it remains to be seen whether this will harm Nanjing's attempt.

The biennial event is due to consist of swimming, diving, high diving, open water swimming, synchronised swimming and water polo.

Argentina, Turkey, Australia and Germany were other countries reportedly interested in hosting, although all ultimately withdrew or opted not to.

Gwangju in South Korea is due to host the 2019 event, meaning four editions in a row may now take place in Asia.

Four of the previous five, however, were or are in Europe, with Rome having hosted in 2009, Barcelona in 2013 and Kazan in 2015.

Budapest is due to host the 2017 edition following the withdrawal of the initial choice of Guadalajara in Mexico last year.