"I visited the place where they are beginning to build the new swimming pool and... it will have all the requirements for an excellent championship because the last condition in Rio was different," FINA President Julio Cesar Maglione told the Kyodo news agency.
"We are sure that it will be fine here."
Olympic organizers in Tokyo are building the pool near the existing Tatsumi International Swimming Center and are mulling over whether the venue should seat 15,000 or 20,000 spectators.
Cornel Marculescu, FINA's executive director, met Tokyo Governor Yuriko Koike in October and pitched for the construction of a new venue instead of the renovation of Tatsumi.
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"I received specific advice on the new aquatics center from the executive director when he was here in October," Mori said.
"We are a big swimming nation, but we don't have the fantastic facility we should have. We need to co-operate so we can leave behind the fantastic facility we need."
(Reporting by Debanjan Bose in Bengaluru, editing by Ed Osmond)
