OCI treasurer Kevin Kilty, secretary-general Dermot Henihan and executive director Stephen Martin have collaborated with the police in the investigation and would be able to return to Ireland, said the source, who asked not to be named because he is not authorised to speak publicly on the matter.
“There is no longer the necessity to keep them here,” the source said.
Pat Hickey, the former head of Ireland’s Olympic council, is still being held in a Rio prison complex.
They accuse PRO10 of funneling tickets to THG Sports, which sold them illegally at inflated prices. A director of THG Sports, Kevin Mallon, was also arrested this month in Brazil.
PRO10 and THG have denied wrongdoing. Hickey’s lawyer in Dublin has not responded to a request for comment.