Market research group Sentix released its investor confidence index for the Eurozone on Monday. The index rose to 6.2 in May from 5.7 in April.

A reading above 0.0 indicates optimism, below indicates pessimism.

"Economic expectations for the Eurozone remain resilient as investors perception about the future development of Japan continues to deteriorate," Sentix said in its statement.

"Moreover, in May investors get wary about the situation of the US economy. Emerging markets proceed their recovery," Sentix added.

The current conditions index was up to 7.0 in May from 6.0 in April.

The expectations index remained unchanged at 5.5 in May.

German investor confidence index rose to 18.3 in May from 17.6 in April.