The fall of Kunduz, the first time the militants had taken a provincial capital in 14 years, has raised questions about how ready Afghan forces are to tackle the insurgency alone.
Read: Afghan forces launch mission to retake northern city from Taliban
"It is important that we carefully examine the current situation and that we make a decision on the basis of the analysis and not according to rigid timelines but based on the current situation," Defense Minister Ursula von der Leyen told reporters.
Although NATO has withdrawn almost all of its combat troops, it still has soldiers stationed there to train local forces. Up to about 850 German troops are in Afghanistan on this mission.
Read: Afghan leader calls on Pakistan to crack down on extremists
Von der Leyen said the situation in Kunduz was worrying and the experiences of the last few days had to feed into NATO's decision about Afghanistan, due in the autumn.
NATO had planned to withdraw all forces by the end of next year.
German forces used to be based in Kunduz and remain stationed in the north of the country.
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