The Organisation for Economic Cooperation and Development said the Greek economy would contract by 0.4 per cent, and said Greece was likely to need additional aid.
"The need for further assistance to achieve fiscal sustainability cannot be excluded," the OECD said.
"If negative macroeconomic risks materialise...Serious consideration should be given to further assistance to achieve debt sustainability," it said.
Greece last week unveiled a budget in which it said the deep recession in the economy would end next year with 0.6 per cent growth, following a 4.0-per cent contraction in 2013.
In a separate study, the OECD said Greece's crisis-hit economy could gain by at least USD 7 billion if hundreds of trade restrictions were abolished.
The organisation said it had found 555 regulatory restrictions that were "potentially harmful" to competition, in a study commissioned by the conservative-led Greek government.
The sectors examined were food processing, retail trade, building materials and tourism, which account for 21 per cent of the Greek economy and almost 27 per cent of total employment, according to 2011 figures.
"But the positive effects on the Greek economy over time are likely to be far greater," it said.
Among the recommendations are the full liberalisation of Sunday trade, which is currently restricted to a handful of pre-holiday sales periods.
The move is opposed by Greek trade associations on the grounds that most businesses are family-operated and are unable to hire more staff owing to persistently poor sales, made worse by recession and three years of tax increases.
The coalition government of conservative Prime Minister Antonis Samaras is attempting to push through legislation liberalising the trade and labour sectors.
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