"Super" Mario Draghi's nickname is very much justified, according to Angel Gurria, the secretary-general of the Organisation for Economic Co-operation and Development (OECD), who has called on governments to do more to tackle the global growth slowdown.

"Central bankers have been the heroes of this story since this financial and economic crisis hit in 2008, but the problem is they have run out of room. It's time for the governments," Gurria told CNBC Friday.