The abducted Germans are employees of a Kabul-based company, Jaeger told journalists in Berlin.
A crisis staff has been established to deal with the case. The German embassy in Kabul and all relevant authorities are doing their best to clear up the case as quickly as possible, the spokesperson added.
The UN confirmed on Wednesday that seven people have been kidnapped in central Afghanistan, at least one of them presumed to be a German national.
Earlier this month, another German citizen and his Afghan translator were freed after a week-long kidnapping ordeal in western Afghanistan.
The former German hostage who reportedly worked for an American construction company in Afghanistan, was on his way to Kabul after being kidnapped in the western Afghan province of Farah.
Kidnappers had initially demanded a 40,000 US dollar ransom for the release of the German man and his Afghan translator.
It was the first kidnapping case of a German citizen in war- stricken Afghanistan after the collapse of the Taliban regime in late 2001.
Germany has presently deployed around 3,000 forces in northern Afghanistan as part of the NATO-led International Security Assistance Force (ISAF).
Some 35,000 ISAF troops are currently based in Afghanistan.