"There will be a plea of not guilty," attorney Jaye Schlachet told AFP.
Schlachet would not say on what grounds Ariel Castro would plead not guilty in the case that has shocked America, urging the public to refrain from a rush to judgment of his client.
"He's not a monster and he shouldn't be demonised by the media," the lawyer said.
The 52-year-old, who is being held on an USD 8 million bond, has been charged with kidnapping and raping three women over around a 10-year period, one of whom bore his child in captivity, according to DNA tests made public.
Michelle Knight, 32, Gina DeJesus, 23, and Amanda Berry, 27, were freed on May 6 after a neighbor heard Berry call for help and kicked in the door to Castro's house in a working-class Cleveland neighborhood.
Cuyahoga County prosecutor Timothy McGinty last week called the home "a torture chamber and private prison," telling reporters: "The horrific brutality and torture that the victims endured for a decade is beyond comprehension."
Cleveland media reported details of a note reportedly found by police in Castro's home in which he describes himself as a "sexual predator" and ponders killing himself and leaving his savings to his victims.
"They are here against their will because they made a mistake of getting in a car with a total stranger," said the note, which was apparently written in 2004 -- the year he allegedly abducted the third victim, DeJesus.
