Japan¡¯s top financial diplomat Masato Kanda said Tuesday that authorities were in close contact with U.S. Treasury Secretary Janet Yellen and other overseas officials almost every day on currencies and broader financial markets.

The remarks likely signal Tokyo¡¯s desire to keep market players on guard about the possibility of currency intervention to prop up the yen, which has been hovering near the ?145 per dollar level ¡ª seen as authorities¡¯ line-in-the-sand on the currency.

¡°We are exchanging views with and communicating with authorities in other countries including our ally the United States not only on currencies and financial markets but also various other issues,¡± Kanda told reporters.

Finance Minister Shunichi Suzuki confirmed Tokyo and Washington were in close contact with each other on currency moves, but declined to reveal what was being discussed.

¡°I have nothing additional to say beyond what I¡¯ve said previously,¡± Suzuki said during a news conference Tuesday when asked about the speed of the yen¡¯s recent declines.

On Friday, Suzuki had warned against ¡°sharp and one-sided moves¡± in the currency market. He also said Japan will take appropriate steps should the yen weaken excessively, after the currency fell past the ?145 to the dollar threshold. Beyond that level, some market players see ?150 as a new threshold.

Authorities say they look at the speed of yen falls, rather than levels, and whether the moves are driven by speculators, in deciding whether to step in.

They also consider it important to seek the support of Group of Seven partners, notably the United States if the intervention involves the dollar.

Japan bought yen in September ¡ª its first foray in the market to boost its currency since 1998 ¡ª after a Bank of Japan decision to maintain ultraloose policy drove the yen as low as ?145 to the dollar. The U.S. Treasury said after last year¡¯s intervention that such actions should be rare.

Last month, the United States removed Japan from its currency monitoring list in its twice-yearly currency report. Some market players say the move may make it easier for Tokyo to intervene in the market.