The former heavyweight star--who served a three-year prison sentence for rape in the early 1990s--allegedly assaulted Florence Botoli, 33, when she refused to take the illegal drug he is said to have offered her at the club in Porto Cervo.
Botoli says, "He took a lot of cocaine and said he wanted to have sex with me.
"When I said no and didn't take the drugs, he tried to force my head down into the powder.
"He punched me and threw me to the floor until his bodyguard told him to calm down."
The 38-year-old sports star--who announced his retirement from boxing following his defeat to Irish fighter Kevin McBride earlier this year--was questioned for several hours by police aboard his private yacht and an official file has now been opened on the case.
A police spokesman says, "Colleagues have questioned Mike Tyson in Panarea about the allegations made against him by a 33-year-old woman.
"At this stage we cannot say anything else because an official file on the case has been opened by the investigating magistrate.
"She will read the file supplied to her by the police and decide if there is enough evidence for the case to continue."
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