However, one of Antinori's lawyers, Tommaso Pietrocarlo, said that the woman signed a consent form for egg donation a month before the surgery after a "consultation with a psychologist" who said she was conscious of the choice.
"This is a persecution. I never forced anyone to do anything," Antinori said. "Why would I have to steal eggs? I'm innocent, and always only did good."
Antinori says he has been harassed by authorities in Italy since the 1970s for his pioneering yet controversial work in fertility treatments.
He shot to fame in 1994 after giving fertility treatment to a 63-year-old Italian woman, which made her become the oldest woman to give birth at the time.
Prosecutors have suspended Antinori's licence to practise for one year as the investigation into charges of aggravated robbery and causing personal injury continues.
At least a dozen women are being questioned about the circumstances surrounding their egg donations.
Last year, Italy lifted a 2004 ban on the use of donated eggs and sperm, legalising the fertility treatment procedure for heterosexual married couples.
Prosecutors are investigating whether Antinori was paying donors cash gifts on the side.
In an interview with La Repubblica newspaper, one donor said Antinori promised €1000 per egg and €500 for every friend brought in.