The article said that the claims had been made by the prisoners lawyers, after they had received declassified U.S intelligence documents that can prove that the suspect is in no way connected to al-Qaida.
Murat Kurnaz, 22, was captured in October 2001 while traveling in Pakistan.
Kurnaz's lawyer, Baher Azmy, has appealed to the German government to put pressure on the U.S for his release.
The article also stated that; three female interrogators entered his cell wearing underwear while he was restrained. One of them put her arms around him from behind and put her hand inside his shirt. She asked if he wanted to "have fun," When he threw his head back at her, knocking her down, a riot-helmeted security team entered and took him to solitary confinement, where he was kept with his hands restrained behind his back.
In the article it was reported that Kurnaz also made claims to have been kept without food for six days.
It is estimated that around 550 prisoners are being held at Guantanamo Bay, many without charge.