Japan's currency hit a fresh 40-year low of 163.99 against the dollar on Thursday and is approaching the closely watched 165 level.
The yen posted its worst week since May, closing in on the 165-per-dollar level after the fresh low.
Analysts say the government is likely seeking the right timing when yen-buying pressure increases to make any intervention more effective.
The Bank of Japan continues to monitor movements but has issued no statements on specific actions.