The search for clues to whether the Federal Reserve will raise U.S. interest rates in September for the first time in nearly a decade is set to intensify next week. U.S. employment rose at a steady clip in July and wages rebounded after unexpectedly stalling in June, signs of an improving economy that could open the door wider to a rate hike soon. But Friday's data did not cement expectations the Fed will act next month. "Because this report was not extraordinarily strong, it was simply in line with expectations, that leaves the markets having to look toward other data," said Paul Christopher, head global market strategist at Wells Fargo Investment Institute in St. Louis. July retail sales, expected on Thursday, will be the key number to look for, while comments by policymakers Dennis Lockhart and William Dudley will also be carefully scrutinised. Atlanta Fed President Lockhart, a centrist who votes on the Fed's policy-setting Open Market Committee, is due to speak today, with New York Fed President Dudley, seen as a dove and a close ally of Fed Chair Janet Yellen, following on Wednesday.On the other side of the pond, Greek bailout talks, U.K. labour market figures and eurozone second quarter GDP data will dominate the agenda in a week where most Europeans will be on summer holidays. While there is nothing like the high drama of recent months in the Greek saga, with signs of progress in the reform talks, negotiations are entering a crunch period this week, with Athens keen to wrap things up just after Aug. 15 to receive aid in time to make an Aug. 20 bond repayment to the European Central Bank. The August reading of Germany's ZEW investor morale indicator on Tuesday and second-quarter preliminary GDP data on Friday will gauge the strength of recovery elsewhere in the eurozone after German and French industrial output data disappointed.