Stock indices traded slightly lower on the uncertainty over Greece's debt crisis. Greek Prime Minister Alexis Tsipras said in a speech on Wednesday that Greeks should vote "no" in Sunday's referendum. He added that "no" would not mean that Greece have to leave the Eurozone.

The head of the Eurogroup Jeroen Dijsselboem said after the telephone conference on Wednesday that there is no reason to continue the debt talks before the referendum on Sunday.

Greek Finance Minister Yannis Varoufakis signalled on Thursday that he will resign if Greeks vote "Yes" in the referendum on Sunday.

Earlier, he said that a deal with Greece's creditors on Monday.

Meanwhile, the producer price inflation in the Eurozone improved slightly in May. Eurozone's producer price index was flat in May, missing expectations for a 0.1% increase, after a 0.1% decline in April.

On a yearly basis, Eurozone's producer price index dropped 2.0% in May, in line with expectations, after a 2.2% fall in April.

Eurozone's producer prices excluding energy fell 0.3% year-on-year in May. Energy prices dropped 6.4%.

Markit's and the Chartered Institute of Purchasing & Supply's construction purchasing managers' index (PMI) for the U.K. increased to 58.1 in June from 55.9 in May, exceeding expectations for a rise to 56.5.

A reading above 50 indicates expansion in the construction sector.

The increase was driven by a rise in the house-building sector, but both commercial and civil engineering activity also increased.

The Nationwide Building Society released its house prices data for the U.K. on Thursday. UK house prices declined 0.2% in June, missing expectations for a 0.5 percent rise, after a 0.2% rise in May. May's figure was revised down from a 0.3% increase.

On a yearly basis, house prices fell to 3.3% in June from 4.6 percent in May, missing forecast of a 4.3% gain.

Current figures:

Name Price Change Change %

FTSE 100 6,608.4 -0.19 0.00%

DAX 11,162.78 -17.72 -0.16 %

CAC 40 4,874.32 -8.87 -0.18 %