NTT DoCoMo Inc. said Thursday it may, if necessary, post appraisal losses on its overseas investments for the 2001 business year due to stock price movements.

Japan's largest mobile phone operator said in a brief statement, however, that no specific decisions on the issue have yet been made.

It was reported earlier in the day that the DoCoMo group will book 1 trillion yen in special losses for 2001, due to heavy losses on investments in overseas mobile phone firms.