Holding up walking sticks and chanting anti-government slogans, thousands of pensioners have joined protest rallies around Greece to demand that the country's new left-wing government end cuts to their monthly payments.

The rallies were held Wednesday's in several Greek cities, the largest in central Athens, where protesters marched to the Labor Ministry.

Prime Minister Alexis Tsipras' two-month-old government has promised to roll back austerity measures but is under pressure from bailout lenders to draw up long-term cost-cutting reforms to unlock frozen rescue loans.