A two-speed global recovery will extend into 2011, with growth slow in developed countries while emerging-market economies power ahead, the International Monetary Fund's chief economist predicted on Thursday.

In an interview with the lender's online magazine, IMF Survey, Olivier Blanchard said the necessity for countries to rebalance their economies by letting exchange rates adjust more freely while taking steps to control debt remains vital.

Without this global rebalancing, there will no healthy recovery, he said.

(Reporting by Glenn Somerville, Editing by Chizu Nomiyama)