The Fund also highlighted the risk of continued volatility in financial markets owing to the differences in monetary conditions in the world's major economies.
Median of estimate in the MAS survey of 24 private economists showed the GDP growth rate to drop to 1.9% for 2016 from 2.2% predicted in the previous poll.
More than 1.1 million refugees, mostly Syrians, have arrived in Europe's biggest economy last year alone, forcing many Merkel supporters to think differently.