Neither his wife nor son have visited him in prison, it emerged last night.
The only visitors the 71-year-old has had have been from the Irish consulate, a prison spokesman said.
This is despite both his wife and son being present with him at the five-star Windsor Marapendi hotel during the Olympics.
Mr Hickey is sharing a cell with Kevin James Mallon, aged 36, the ticketing executive whose arrest on the day of the Olympic opening ceremony sparked this scandal.
Neither Mr Hickey’s lawyers, a judicial spokesman, nor police would comment last night on any proceedings to secure his release as investigations continue.
Today, police will interview two more members of the OCI committee, Kevin Kilty and Stephen Martin, who police have barred from leaving Brazil. The two are being officially considered suspects until they have been questioned.
Another official, Dermot Henihan, was interviewed on Tuesday and is now not considered a suspect. The three have not been arrested.
Police are still keen to speak to OCI vice-president John Delaney, acting president William O’Brien, and Mr Hickey’s personal assistant Linda O’Reilly. But those individuals left Brazil before police tried to seize their passports on Sunday.
All those being sought by police in Brazil deny any wrongdoing.
Mr Hickey and Mr Mallon, an executive of ticketing firm THG Sports, remain under the spotlight in the €3m investigation, in which police allege 823 Olympic tickets were being sold for up to €7,000, sometimes for 18 times their face value.
Also sought is British millionaire Marcus Evans, aged 52, the owner of THG. Police this week released a chain of emails between Mr Hickey and Mr Evans show the pair discussing Olympic tickets from the OCI allocation.
Police say the emails show illegal activity, as THG Sports was not an authorised reseller of Olympic tickets. The firm had the OCI rights for the 2012 and 2014 Games, but not for Rio 2016. THG denies all allegations.
In an email on August 3, Mr Hickey wrote to Mr Evans: “We have tickets left that [official reseller] Pro10 don’t want so before we get rid of them have you any use for them?”
Mr Evans replied: “I am afraid I have more than I need as well so all we can do is put back on portal for hopeful resell.”
Mr Hickey replied: “I can confirm to you now that I do not require any of the opening or closing ceremony tickets that was part of our NOC allocation. You can use them all.”
Detective Ricardo Barboza de Souza said: “The OCI was the facilitator of these tickets finding their way to THG. The link between the two men is very clear to us.”
Police also found 30 tickets to the opening ceremony in the possession of THG that were meant for the Irish “Olympic family” and not to be resold at all, said detective Aloysio Falcão. “It is clear that Mr Hickey passed these tickets to Marcus Evans.”
On Sunday, police raided the offices of the OCI at the Olympic Village and the Windsor Marapendi Hotel where officials were staying. They found 228 extra tickets there, which Mr Kilty told them were meant for athletes, it was claimed.
Mr Hickey and Mr Mallon face charges of facilitating touting, which carries a sentence of two to four years; forming a criminal cartel, which has a sentence of between one and three; and illicit marketing, which carries a sentence of six months to one year.
They are accused of allowing Olympic tickets to be diverted from the OCI, via its official reseller Pro10 Sports Management, to THG Sports.
As well as those already mentioned, police are also seeking other directors of THG Sports: Irishman David Patrick Gilmour, 35; British man Martin Studd, 49; and Dutchman Martin van Os, 45; and three directors of Pro10 — Brit Michael Glynn and Irishmen Ken Murray and Eamonn Collins.