NEW YORK (TheStreet) -- Stock futures were modestly lower, following European markets into the red as Greece debt talks continued with no clear resolution in sight. 

S&P 500 futures fell 0.15%, Dow Jones Industrial Average futures slipped 0.12%, and Nasdaq futures slid 0.18%. 

European markets were lower after Greece submitted its latest list of reforms to creditors, though sources have told Reuters that the plan offers no major new concessions. Leaders of Germany, France and a number of Greece's other international creditors said on Monday that they would work with "real intensity" to seal a deal to prevent Athens from defaulting. 

"We have submitted a realistic plan for Greece to exit the crisis," Greece's Prime Minister Alexis Tsipras told reporters. "A realistic plan, whose acceptance by the institutions, our lenders and our partners in Europe will mark the end of the scenario of divisions in Europe."

Trouble in Greece is reaching a boiling point as the debt-ravaged country faces a repayment to the International Monetary Fund on Friday of 300 million euros ($329 million). In total, Greece needs to repay the IMF nearly 1.6 billion euros ($1.75 billion) this month. 

Dollar General (DG) added nearly 3% in premarket trading after beating analysts' quarterly estimates on its bottom line. The discount retailer earned 84 cents a share in its first quarter, 3 cents higher than expected, while same-store sales rose 3.7%. 

Medtronic (MDT) added 1% after a better-than-expected fourth quarter. The medical equipment developer earned $1.16 a share, a nickel above estimates, while revenue of $7.3 billion surged 59.7% from a year earlier. 

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