Standard & Poor's Corp. has placed the long-term credit ratings of 10 major Japanese banks and the long- and short-term ratings on two trust banks under review for possible downgrade in the near future, the U.S. credit-rating agency said Wednesday.

S&P said it has placed the 10 major lenders on CreditWatch with negative implications and affirmed their short-term ratings.

The 10 banks are: the Bank of Tokyo-Mitsubishi and Mitsubishi Trust & Banking Corp. under Mitsubishi Tokyo Financial Group; Dai-Ichi Kangyo Bank, Fuji Bank, the Industrial Bank of Japan and Yasuda Trust & Banking Co. under Mizuho Holdings; Sanwa Bank and Tokai Bank under UFJ Holdings; Norinchukin Bank; and Sumitomo Mitsui Banking Corp.