"We have sent a request to the ECB on ELA approval for all four major banks to have a shield for the banking system," a Greek central bank official told Reuters.
The banks fear that the expected election of the far-left Syriza party, which will be looking to renegotiate the terms of Greece's bailout, could make it difficult for banks to maintain liquidity, according to the New York Times.
Political uncertainty ahead of elections led to people making mass withdrawal from banks in 2012, according to the Financial Times, a trend which could repeat this year.
International rating agency Fitch warned, however, that "early elections to be held on 25 January have made the direction of Greek policymaking more uncertain" and that a possible "prolonged political deadlock" in Greece "would increase the risk of financing difficulties and a return to recession."
Greece decided to hold snap parliamentary elections on January 25 after the country's parliament failed to elect a president in the third and final round of voting on December 29, 2014, and was subsequently dissolved.