Germany is reportedly bracing for up to 1.5 million asylum seekers to arrive in the country this year, up from a previous estimate of 800,000 to 1 million.
The Bild daily, Germany's top-selling newspaper, in a report on October 5 cited a classified government forecast.
Many of the hundreds of thousands of refugees and migrants who have arrived in Europe have headed to Germany.
"Migratory pressures will increase further. We now expect 7-10,000 illegal border crossings every day in the fourth quarter," Bild cited the report as saying.
Bild said German authorities were concerned about the risk of a "breakdown of provisions" and that they were already struggling to get enough living containers and sanitary facilities for new arrivals.
Chancellor Angela Merkel has said Germany is not going to consider weakening its commitment to sheltering asylum seekers.