The European Central Bank's (ECB) President Mario Draghi said on Tuesday that the central bank will review the volume of its asset-buying programme at the monetary policy meeting in December.

He pointed out that the ECB will add further stimulus measures if needed.

"The Governing Council is willing and able to act by using all the instruments available within its mandate if warranted in order to maintain an appropriate degree of monetary accommodation," Draghi said.

The ECB president noted that there are "downside risks to the outlook for growth and inflation" from the slowdown in emerging economies.