Prime Minister Yoshihide Suga on Saturday sounded optimistic about lifting Japan's state of emergency over the coronavirus pandemic when it expires at the end of this month, saying the COVID-19 situation in the country is improving.

"The situation has certainly taken a turn for the better," Suga told reporters in Washington a day after attending the first in-person meeting of the leaders of Japan, the United States, Australia and India.

File photo taken on Sept. 25, 2021, shows Japanese Prime Minister Yoshihide Suga (2nd from R) leaving for home after a visit to the United States at Andrews Air Force Base, outside Washington. (Kyodo)

Citing the fact that the number of new cases in Japan has dropped to about 3,000 a day from about 25,000 at one point, he said, "I would like to decide (whether to lift the emergency) after hearing expert opinions."

Suga, who returned to Japan on Sunday, is expected to make his decision after discussing the matter with relevant ministers on Monday, and the decision will be formalized at a meeting of a government task force on the coronavirus response on Tuesday.

The declining trend of infections in the country was also seen Sunday as the Tokyo metropolitan government reported 299 new cases in the capital, with the seven-day rolling average falling to 362.7 per day, more than halved from 815.3 logged a week ago.

The number of those hospitalized with severe symptoms decreased by 2 from Saturday to 129, according to the metropolitan government.

Suga, who will step down in early October, also said oral medication for COVID-19 could be in use within this year.

In Tokyo on Sunday, health minister Norihisa Tamura also suggested the high likelihood of the state of emergency ending on Thursday, saying, "I think we can realize it given the current situation."

But Tamura said the restrictions on people's lives will not be lifted in one go.

Steps to balance anti-infection measures and resumption of full economic activities must proceed "in stages" while the impact of easing is carefully monitored, the minister of health, labor and welfare said.

In the latest round of the emergency covering Tokyo and 18 other prefectures, the government requested that people avoid going to crowded areas and that restaurants close by 8 p.m. and not serve alcohol.

As the fifth wave of infections this summer strained the country's medical system and forced many people to recuperate at home, the Ministry of Health, Labor and Welfare is now reviewing its medical services to prepare for a potential sixth wave.

Asked about the Trans-Pacific Partnership free trade agreement, an issue raised at the Quad summit, Suga said, "We have always considered that the return of the United States (to the TPP) is important."

The prime minister, however, declined to comment on whether he urged U.S. President Joe Biden during the summit to rejoin the regional FTA, formally known as the Comprehensive and Progressive Agreement for Trans-Pacific Partnership.

Former President Barack Obama's administration had promoted the TPP to counter China's rising assertiveness, but Obama's successor Donald Trump withdrew the United States from the pact in 2017.

Following Suga's announcement earlier this month of his intention to resign, the ruling Liberal Democratic Party is holding its presidential election on Wednesday to pick his successor. The winner is almost certain to be elected as the next prime minister in an extraordinary Diet session on Oct. 4 as the party controls the House of Representatives, the powerful lower chamber of parliament.

The outgoing premier said he will not seek a Cabinet post under a new leader, hoping only to focus on policies that he has worked on up to now that he feels are necessary.

Four senior LDP lawmakers are vying for the post of party president and thus prime minister -- vaccination minister Taro Kono, former Foreign Minister Fumio Kishida, former communications minister Sanae Takaichi and the LDP's executive acting secretary general Seiko Noda.

Suga has expressed his support for Kono.

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