Even if the central bank doesn't pull the trigger later, it is still expected to by the end of the year.
Rating agency Standard and Poor's could upgrade Greece's rock bottom credit rating "pretty quickly"
Markets are also watching a meeting in Moscow of G20 finance ministers for signs of an orchestrated approach to the end of US money-printing, which could help defuse volatility in global markets.
Despite December's deal by U.S. politicians to avoid the so-called "fiscal cliff" of spending cuts and tax hikes, Fitch's head of sovereign ratings, David Riley, said pressure on the country's rating was increasing.