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Wall Street watches Coca-Cola, Greece debt woes

Selloff makes dent in bullish February start

U.S. stock index futures signaled a higher open on Tuesday, as negotiations over Greece's bailout program continue to keep investors cautious. Coca-Cola's fourth-quarter earnings will also be in focus.

Concerns over the Greek debt negotiations continue to weigh on market sentiment. Speaking from Washington, German Chancellor Angela Merkel said she was looking for a "viable recommendation" from Greece on Monday, after Prime Minister Alexis Tsipras reiterated his pledge to end Greece's current bailout Sunday.

Read MoreGreeceneeds to play by the rules: France

The bodies making sure Greece sticks to the bailout's rules —the troika of the European Central Bank, International Monetary Fund and European Commission – have said Greece will not receive a final tranche of aid under the current bailout plan. The ECB has also refused Greece's request for a bridging loan to tide it over once its bailout officially ends February 28.

European equities were mixed on Tuesday as the impasse between Greece and its international creditors continues.

UBS, the biggest Swiss bank, to mark its biggest payout since the credit crisis Tuesday, but warned the Swiss franc's strength could hit future profits. Shares of the bank were trading 2 percent lower in Europe following the results.

in the U.S., Coca-Cola is set to report before market open, along with KKR, Reynolds America, Starwood Hotels, Dean Foods and Regeneron.

Western Union, and are all due after the bell.

The week continues with a fairly light data schedule Tuesday, when wholesale inventories figures for December are due at 10:00 am ET. JOLTS job opening data for December, also released at 10:00 am ET, may be of interest in the context of last week's robust labor market data.

Federal Reserve Bank of Richmond President Jeffrey Lacker is also due to speak on education and economic growth at a forum in North Carolina early Tuesday.