The Cerberus Group may hold on to a controlling stake in Aozora Bank for keeps in an effort to cement its position in Japan, according to James Danforth Quayle, an adviser for the U.S. investment fund and a member of Aozora Bank's board of directors.

"We may never sell Aozora," the former U.S. vice president said in an interview earlier this week.

He was addressing fears within the Financial Services Agency that the group is only out to turn a quick profit in Japan by dumping its stake in the formerly nationalized bank as soon as the share value climbs to a certain point.