The Agriculture Ministry will question Nippon Meat Packers president Hiroji Okoso today about a subsidiary's suspected defrauding of a state-run beef buyback programme, Kyodo News reported.
The voluntary questioning will begin at 9:30GMT, the sources said.
At the centre of the case is some 1.3 tons of imported beef Nippon Food had passed off as domestic and abused the buyback programme, which was intended to bail out the domestic cattle industry battered by the outbreak of mad cow disease in Japan last September.
Okoso has denied that the parent company was involved in the deception.
Meanwhile, the agricultural ministry said it will release findings gathered so far in its investigation into the case today.