The opposition Democratic Party of Japan plans to urge embattled economy minister Akira Amari, who attended the World Economic Forum in Davos this weekend, to clarify graft allegations made against him in a tabloid magazine.

A key architect of Prime Minister Shinzo Abe's deflation-busting "Abenomics" program, Amari and his secretary have been accused by the weekly magazine Shukan Bunshun of taking money from an unidentified construction company in an alleged violation of political funding law.

"I want him to show good faith and clear up the graft allegations," Tetsuro Fukuyama, the DPJ's vice secretary-general, said on NHK Sunday. The party wants to hear from Amari on Monday before the start of the Lower House plenary session, which is scheduled to kick off a day later, Fukuyama said.