Stock index futures pointed to a mostly flat open on Monday, following three days of losses as investors remained cautious about Greece's fiscal future.

The country's parliament will begin to debate a deeply unpopular austerity plan that must be approved in exchange for the next bailout payment. A Greek minister warned of catastrophe if the measure is not passed in a vote set for later this week.

In France, President Nicolas Sarkozy said the government had an agreement with French banks on rolling over Greek debt into new 30-year bonds.

Traders see a Greek sovereign default as unlikely, and the S&P holding its 200-day moving average was viewed as a sign of technical support following two months of heavy selling that brought the index down about 7 percent.

We're at an important juncture with Greece, but staying above the 200-day moving average is more evidence that we're stabilizing, not deteriorating, said Christopher Verrone, lead technical analyst at Strategas Research Partners in New York.

In the latest economic data, U.S. consumer spending was unchanged in May, according to a government report, while a reading on Midwest manufacturing rose slightly in May from the prior month. Futures barely moved after the data.

S&P 500 futures were up 1.8 points, slightly over fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures added 23 points and Nasdaq 100 futures rose 5.5 points.

Tobacco giant Philip Morris International Inc

threatened to sue the Australian government over its plan to be the first country to introduce plain, brand-less packaging for cigarettes.

A new type of diabetes pill being developed by Bristol-Myers Squibb Co and AstraZeneca Plc was effective in a two-year study but more bladder and breast cancers was found in patients treated with the drug. Bristol rose 1.1 percent to $29.25 in light premarket trading while U.S.-listed shares of Astra lost 1.3 percent to $48.36.

Citigroup Inc told government officials that the 3,400 customers whose credit card information was hacked suffered about $2.7 million in losses, the Wall Street Journal reported. Citigroup shares dipped 2 cents to $39.57 in premarket trading.

Small-cap tech stocks could be the new value names following the annual adjustment to the Russell indexes Friday.

Wall Street dropped for a third day Friday on worries about the Italian banking sector and Greece's debt crisis, but the S&P held its 200-day moving average, a sign buyers continued to see value.

(Editing by Jeffrey Benkoe)

Citigroup