Chief Cabinet Secretary Yoshito Sengoku's recent remarks about a possible grand coalition between the ruling Democratic Party of Japan and the Liberal Democratic Party have drawn cautious responses from the opposition camp.

"We will focus on the problem of the ruling parties because we are an opposition party," LDP chief Sadakazu Tanigaki said in a speech Tuesday, denying his party would consider such a tieup.

"We aren't thinking about it," LDP Secretary General Tadamori Oshima said.