In morning Tokyo trade, the greenback fetched 99.30 yen from 99.11 yen in New York on Friday.

Fed board member Jeremy Stein suggested in a speech in New York on Friday that the central bank could make a decision to begin slowing its stimulus programme within three months.

Stein, a member of the Fed's policy committee, cited September as a possible start time for a wind down, saying accumulated economic data for the past year, and not just the most recent figures, would be taken into account.

The dollar is expected to benefit when the Fed eventually begins to reel in the programme, which it says will happen when the economy is able to stand on its own feet.

Comments from other Fed officials last week pointed to a longer timeframe. The easy monetary policy has been credited with boosting global equity markets.