A prison in Munich has determined that John Demjanjuk is fit to be kept in jail pending a trial on war crimes charges.
The 89-year-old was deported from the US earlier this week, and is expected to face trial charged with helping to send thousands of Jews to gas chambers in the Sobibor concentration camp in Poland.
Doctors in Stadelheim jail have still to determine whether Mr Demjanjuk is fit to undergo the stress of an inevitably lengthy trial.
Prosecutors said medical checks on could take some time.
Deputy prison director Jochen Menzel said Mr Demjanjuk was in ‘strikingly good condition’.
His family in the US, where he was employed for several decades as an auto worker in Ohio, had argued he was too sick to travel but this week lost their long battle to prevent his deportation.
The US government's legal battle with Mr Demjanjuk has stretched over 32 years. The Justice Department moved to revoke his citizenship in 1977, saying he lied when he entered the country by concealing his role as a guard at Nazi death camps.
In 1986, he was sent to Israel, tried, convicted and sentenced to death for being ‘Ivan the Terrible,’ a notoriously cruel guard who ran the gas chambers at the Treblinka death camp, also in Poland.
But evidence from Soviet files indicated that another man, Ivan Marchenko, was Ivan the Terrible. Mr Demjanjuk's conviction was overturned in 1993, and he returned to the US.
In 2001, US authorities charged him with having been a guard at Sobibor, and another round of deportation proceedings began.
