European Central Bank President Mario Draghi said a further appreciation of the euro would trigger more monetary stimulus in his strongest warning yet about the region's rising currency.

The toughest in a series of currency comments from Draghi and fellow ECB officials came after the euro appreciated 6 percent versus the dollar over the past year.

Draghi, attending spring meetings of the International Monetary Fund, said the euro had a "significant" impact on price stability.

Draghi is already considering whether to introduce more stimulus including possibly quantitative easing after the inflation rate of the 18-nation euro area dropped to 0.5 percent in March, the lowest level in more than four years.

The inflation rate would be at about 1 percent without the currency's appreciation, France's central bank Governor Christian Noyer said Saturday.

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