Moody's Investors Service said it put Greece's Ba1 bond rating under review for possible multi notch downgrade on suspicions the highly-indebted EU nation in 2009 would be to reduce debt to GDP ration over the coming three to five years.

Eurostat upwardly revised Greece's debt figures in mid November to become the most indebt EU nation last year. EU said debt to GDP ration will climb to 156% in 2012 from 127% in 2009.