World Bank President Robert Zoellick said the United States should not take the dollar's status as the world's key reserve currency for granted because other options are emerging.

In excerpts released on Sunday from a speech that he is to deliver on Monday, Zoellick said global economic forces were shifting and it was time now to prepare for the fact that growth will come from multiple sources.

"The United States would be mistaken to take for granted the dollar's place as the world's predominant reserve currency," he said. "Looking forward, there will increasingly be other options.

We need a system of international political economy that reflects a new multi-polarity of growth," Zoellick said. It needs to integrate rising economic powers as 'responsible stakeholders' while recognizing that these countries are still home to hundreds of millions of poor and face staggering challenges of development.".