However, at this stage, the three countries have not confirmed which cities they will be putting forward to host the event.

Formal bids will be submitted by April, with FINA choosing the 2019 host in July in Barcelona, at next year's World Championships.

At the 14th FINA World Championships in Shanghai last year, synchronised swimmer Natalia Ishchenko of Russia was the most decorated competitor winning six gold medals

Kazan in Russia will host the 2015 Championships, while Guadalajara, Mexico, will stage the 2017 event.

The FINA World Championships feature five aquatics disciplines: swimming; water polo; diving; open water; and synchronised swimming.

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