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U.S. stock-index futures drifted to the downside on Monday on the heels of Wall Street's sixth-straight weekly win.

Today's Markets

As of 8:25 a.m. ET, Dow Jones Industrial Average futures fell 20 points to 13227, S&P 500 futures slipped 1.3 points to 1414 and Nasdaq 100 futures rose 3.8 points to 2780.

The broad S&P 500 climbed 0.87% last week in fairly quiet trade, but has managed to tack on 4.7% in the past six weeks. The spotlight is on central banks as the week kicks off. 

German newspaper Der Spiegel reported over the weekend that the European Central Bank is planning on targeting sovereign bond spreads in a plan that could potentially put a cap on how much a country's borrowing cost could rise as compared to the German bund. Such a move could help countries like Spain and Italy that are facing painfully high borrowing costs. 

However, Germany's Finance Ministry said Monday that it is unaware of any such plan. 

"In purely theoretical, abstract terms, such an instrument would certainly be very problematic. But I know of no proposal along these lines," a spokesperson for the Ministry said, according to a report by Reuters

In Asia, a publication run by the People's Bank of China said the central bank has no plans to cut banks' required reserve ratios (RRR). The RRR is a tool the bank sometimes uses for monetary policy -- lower rates would provide a boost to the banking system there and potentially work as a stimulus for the world's No. 2 economy. 

Minutes from the Federal Reserve's last policy meeting are on tap for Wednesday. Fed watchers will be looking for signs that the central bank may take more action on the U.S. economy. Analysts will also be paying close attention to the Fed's economic symposium in Jackson Hole, Wyo.

There are no major economic releases slated for release on the day. 

In corporate news, Aetna (AET) revealed plans to buy rival Coventry Health Care (CVH) for $5.7 billion in cash and stock. Best Buy (BBY) tapped Hubert Joly, a former senior executive at Carlson, as its new chief executive.

Oil prices continued rising after jumping 3.4% last week in the third-straight week of gains. The benchmark contract traded in New York rose 2 cents, or 0.02%, to $96.04 a barrel. Wholesale New York Harbor gasoline gained 0.06% to $3.029 a gallon. 

In metals, gold fell $3, or 0.19%, to $1,616 a troy ounce. 

Foreign Markets

The Euro Stoxx 50 climbed 0.21% to 2477, the English FTSE 100 dipped 0.34% to 5833 and the German DAX rose 0.21% to 7055. 

In Asia, the Japanese Nikkei 225 gained 0.09% to 9171 and the Chinese Hang Seng fell 0.06% to 20104. 

Follow Adam Samson on Twitter @adamsamson.