Greece's euro area-backed bailout expires, putting the country on the brink of default unless it can reach a new deal with its creditors.
On Saturday, Eurozone finance ministers rejected Greece's request for an extension.
In early June, Greece announced its plans to bundle its loan repayments into one lump sum of about $1.7 billion.
On the earnings front, ConAgra Foods is scheduled to post its fiscal fourth quarter earnings before the market opens.
Wall Street is expecting earnings of 59 cents a share on revenue of $4.135 billion for the period, according to analysts polled by Thomson Reuters.
Company CEO Sean Connolly took the reins as head of ConAgra from former chief Gary Rodkin in early April.
TheStreet's Jim Cramer, Portfolio Manager of the Action Alerts PLUS Charitable Trust Portfolio says he's watching earnings from the packaged foods powerhouse. He thinks ConAgra should dump its private-label foods unit Ralcorp.
The company bought it for nearly $5 billion in 2012.
Omaha-based ConAgra Foods is a packaged food company that provides branded and private branded foods in households, commercial foods businesses and foodservice operations.
The company's brands include Banquet, Chef Boyardee, Egg Beaters, Healthy Choice, Hebrew National, Hunt's, Marie Callender's, Orville Redenbacher's, PAM, Peter Pan, Reddi-wip, Slim Jim and Snack Pack.
CongAra Foods products are sold in grocery, convenience, mass merchandise, club, and drug stores. On the economic calendar, we point out the Redbook, the S&P Case-Shiller home price index, Chicago PMI and the consumer confidence level for June.