European equities closed lower on Friday as investors looked ahead to Sunday, when a referendum that could affect Greece's future in the euro zone will take place.
The pan-European FTSEurofirst 300 closed provisionally 0.6 percent lower on the day and more than 13 percent down on the week.
Greek stocks were closed this week.
All eyes were on the Greek referendum this weekend, at which Greeks will vote on whether to accept a creditor-proposed bailout deal conditional on further austerity. Voting "no" could jeopardize Greece's future in the euro zone.
Capital controls on Greek banks will remain in place until after the vote. European Central Bank policymakers plan to next discuss emergency liquidity assistance for Greek banks on Monday, a person familiar with the matter told Reuters Thursday.
Shares of some major banks in the U.K., including Barclays, RBS and Standard Chartered, closed more than 1 percent lower after Brazilian authorities said on Thursday that they were investigating 15 financial institutions on suspicion of rigging the Brazilian real in foreign exchange trading.
U.S. stocks were closed on Friday for the Independence Day public holiday.
Follow us on Twitter: @CNBCWorld