Over recent times, concerns regarding the region's outlook have grown as many member states continue to struggle to cope with the impact of the ongoing debt crisis there.
Countries such as Spain and Italy are at risk of suffering the same fate as Ireland, Portugal and Greece in terms of having to accept a bailout package.
However, there are also increasing worries about the health of major economic powers in the area such as Germany and France as it is thought they may become affected by spreading debt.
And, with this in mind, Moody's has today (28 November) indicated that all bonds could be reduced sooner rather than later.
"While Moody's central scenario remains that the euro area will be preserved without further widespread defaults, even this positive scenario carries very negative rating implications in the interim period," it noted.
By Claire Archer