The captain, New Zealander James Cutfield, is suspected of a crime in connection with the shipwreck in August, along with two other crew members, but has so far chosen to exercise his right to remain silent during questioning, writes La Stampa.
According to Cutfield's lawyers, he is too tired and needs "a complete and correct defense line that requires data and information that we do not have yet".
According to relatives, he has repeatedly said that he did everything to save the people on board, but he has also been accused of abandoning the ship.
When the over 50-meter-long luxury yacht Bayesian sank off Sicily on August 19, there were around 20 people on board. It filled with water in less than a quarter of an hour and seven people died, including IT magnate Mike Lynch and his daughter.