China could purchase large amounts of struggling European debt at bargain prices, taking away a major threat to the euro zone, Harvard Professor Niall Ferguson told CNBC Thursday.

On the assumption that the European Monetary Union will not allow the shared-currency system break up, China can pick up debt from countries like Greece and Ireland "very cheaply" and "that might even be the simple solution to the problem of the euro zone," Ferguson said at the World Economic Forum in Davos, Switzerland.