The S&P 500 is currently considered statistically expensive across 19 of 20 valuation metrics, indicating limited long-term price growth, Bank of America said in a Monday report.

Pfizer (NYSE:PFE)'s quarterly financial report on Tuesday comes at a critical moment for the U.S. drugmaker and its CEO, as activist hedge fund Starboard Value ramps up the pressure to demonstrate concrete results of a promised turnaround.

The U.S. dollar steadied Monday, on course for a hefty monthly gain, while the euro was steady at the start of an action-packed week.

Europe's major airlines including Lufthansa and Air France-KLM are expected to report another quarter dragged down by rising costs and limited planes, with no sign of delivery delays from planemakers Boeing (NYSE:BA) and Airbus improving any time soon.

Bitcoin rose slightly on Monday after logging a muted performance over the weekend as a push towards record highs was muddled by a report that the U.S. government was probing stablecoin giant Tether. 

Gold prices fell from near record highs in Asian trade on Monday as easing concerns over a bigger conflict in the Middle East dented safe haven demand for the yellow metal.