The German government is expecting the number of people seeking asylum to double to 400,000 in 2015, said its Interior Minister Thomas de Maiziere.
The minister made the comments during a meeting with members of the ruling left-right coalition late on Monday.
The federal government is already under pressure for extra funds from Germany's 16 states to help them cope with the surge of asylum seekers on top of a promised 1 billion euros ($1.1 billion) for 2015 and 2016.
Earlier this year thousands of Germans took to the streets in marches organised by anti-Islam and anti-immigration group PEGIDA in the eastern city of Dresden but its support has since waned.
Financial aid is one of the issues due to be discussed at a top-level crisis meeting on refugees at the chancellery in Berlin on Friday
Pictured as she was rescued from a stricken boat off the Greek island of Rhodes, the terrified face of Wegasi Nebiat, above, last week became the symbol of Europe's migration crisis. The 24-year-old was among more than 100 migrants on a rickety craft that capsized en route from Turkey, drowning three of its occupants. But images of her being plucked to safety by a burly Greek rescuer have also put the spotlight on her homeland of Eritrea - a brutal dictatorship dubbed Africa's North Korea.