U.S. stock markets were tipped to open lower on Friday, giving up some of the previous day's gains ahead of inflation data that could offer clues on the timing of a U.S. rate rise.
There was also focus on Germany's parliament, which is set to vote on starting discussions over the reform-for-aid package agreed for Greece at the start of the week. Germany is one of several countries in the euro area that must vote for the rescue deal to go ahead.
The European Central Bank, meanwhile, said on Thursday it would increase emergency liquidity to Greek banks, which will reopen on Monday after being closed for three weeks.
Stock index futures were in negative territory during early London trade, with Dow Jones industrial average futures down almost 40 points.