Democratic Party of Japan Secretary General Ichiro Ozawa plans to tell prosecutors he had at least ¥600 million in assets at the time his political fund management body made a controversial land purchase, enough to finance the transaction, sources said Wednesday.

Prosecutors, who plan to question Ozawa on a voluntary basis later in the week regarding the ¥352 million land deal in 2004, suspect secret political donations from construction companies made up part of the money used for the purchase.

Ozawa plans to explain that most of the ¥600 million — ¥300 million at his home and the remaining in deposits — were in his wife's name or those of their three children, the sources said.