U.S. stock index futures were slightly higher, but investors remained cautious following a string of disappointing economic reports last week and amid the ongoing uncertainty in the euro zone.
The G7 ministers and central bankers around the world held an emergency call to discuss the euro zone's worsening debt crisis, but no major agreements or plans were formed.
European shares turned mixed in thin trading. The U.K. market is still closed due to the extended holiday for the Queen’s Diamond Jubilee.
Ratings agency Egan-Jones downgraded the U.K.'s credit ratingfrom double-A to double-A minus late Monday afternoon.
Shares closed flat in choppy trade on Monday.
Facebook was slightly higher in pre-market trading after the social-networking giant closed at an all-time low in the previous session.
Meanwhile, Oracle said it will acquire Collective Intellect, which helps businesses to get information about consumers from Facebook and Twitter pages. This comes a day after rival Salesforce.com announced a deal to purchase social media marketing company Buddy Media.