The individual came into contact with an infected person on board the MV Hondius, anchored off Cape Verde, but is asymptomatic, the fire service in the western German city of Düsseldorf told AFP.
They did not provide any further details about the person, such as nationality or gender.
The World Health Organization said earlier that three people -- two crew members and one other person thought to be infected -- were being evacuated from the ship and would be flown to the Netherlands.
A team from the fire service are on their way to pick up the individual, who will then be taken to the university hospital in Düsseldorf, the spokesman told AFP.
"The earliest we expect the transport to be back is in the evening," he said, adding that the hospital had "various options" for dealing with such a case.
The vessel has been at the centre of an international health scare since Saturday, when the UN's health agency was informed that three passengers had died and the suspected cause was hantavirus.
The rare disease is usually spread from infected rodents, typically through urine, droppings and saliva.
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