The government nominated Bank of Japan Executive Director Hirohide Yamaguchi on Wednesday to fill the central bank's longtime vacant deputy governor post amid the ongoing global financial crisis.

To succeed in appointing Yamaguchi, who is in charge of the BOJ's monetary affairs, the government will need the approval of both chambers of the Diet, including the opposition-controlled Upper House.

Chief Cabinet Secretary Takeo Kawamura said he is hopeful the opposition parties will understand why the 57-year-old Yamaguchi, now in charge of the BOJ's monetary affairs as an executive director, is suited for the deputy governor position.