TOKYO - Japan's top trade negotiator, Ryosei Akazawa, could travel to Washington as soon as next week for a third round of trade talks with the US, two sources with knowledge of the plans told Reuters on Thursday.

The date of his visit was fluid and would depend on how much progress the two countries can make in narrowing differences in staff-level negotiations, one of the sources said on condition of anonymity as he was not authorised to speak publicly.

Japan is considering a package of proposals to gain US concessions that may include increased imports of US corn and soy, technical cooperation in shipbuilding, and revision to inspection standards for imported automobiles, the source said.

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There is uncertainty on whether the two sides can iron out differences over Japan's priority, which is to win exemptions from US tariffs on automobile and auto parts - the mainstay of its export-heavy economy.

"We will seek reviews of the range of US tariff measures, such as those on automobiles, auto parts, steel, aluminium as well as the reciprocal tariffs, that are deeply regrettable," Akazawa, who is also economic revitalization minister, told a news conference on Wednesday.

On April 2, US President Donald Trump imposed a 10 percent tariff on all countries except Canada, Mexico and China, along with higher tariff rates for many big trading partners, including Japan, which faces a 24 percent tariff rate starting in July unless it can negotiate a deal with the US.

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Japanese policymakers and ruling party lawmakers have said they see no merit in striking a deal with the US unless a 25 percent tariff on automobile imports is lifted, given the huge impact the industry has on Japan's export-heavy economy.

The impact is already evident in Japan's automobile sector. Mazda reported a 45.1 percent drop in net profit for the fiscal year that ended in March, and held off on disclosing earnings estimates for the current year through March 2026.

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During his second visit to Washington on May 1, Akazawa made a request to US Treasury Secretary Scott Bessent for reviewing the 25 percent automobile and auto parts tariffs, though the two sides could not reach common ground.

While Japan was the first major economy to start bilateral trade talks with the US, Britain was the first to strike a deal with the Trump administration.