A survey by the ZEW Institute and Credit Suisse Group showed on Wednesday that Switzerland's economic sentiment index dropped to -5.4 points in July from 0.1 points in June as Swiss economic expectations worsened.

The current conditions index by 1.4 points to -21.6 points in July from -23.0 points in June.

"The economic outlook for Switzerland has dimmed again, and while analysts expect to see the strongest economic momentum in the Eurozone over the next six months, the present state of the Eurozone economy is still rated as poor," Credit Suisse said.