Spanish authorities have said that Gerard Hutch remains under criminal investigation and that charges against him for alleged money laundering are being considered.
The investigation is focused on the movements of large sums of money and the purchase of a number of properties in Spain.
The Spanish authorities have described the nine as "alleged members of a gang of international criminals who are being investigated as alleged perpetrators of money laundering crimes by a criminal organisation".
The investigating magistrate has taken statements from them and all nine have now been released on bail.
Hutch was released on 4 November last year on €100,000 bail and stood as a candidate in Dublin Central in last year's general election, almost getting elected to Dáil Éireann.
The Spanish authorities said today that ten people are under investigation and that the proceedings have been referred to the Public Prosecutor's Office for a report on whether or not to proceed to trial and, if so, for the issuance of provisional charges.
The court also said that preliminary investigations become abbreviated proceedings when the investigating magistrate or judge, after gathering all the evidence deemed relevant, believes there is sufficient evidence of criminal activity to formally initiate criminal proceedings against the individuals under investigation.
"In cases where the potential sentence is less than nine years in prison, the abbreviated procedure is chosen. If the potential sentence exceeds this limit, a formal trial would be initiated," it added.
Hutch was described in the Special Criminal Court as the leader of the Hutch family and found not guilty of the murder of David Byrne, a Kinahan gang member at the Regency Hotel in Dublin in February 2016.
The murder led to an escalation in the ongoing feud between the Hutch and the Kinahan Organised Crime Groups which has so far cost 18 lives.
