A 12-person jury told Judge Andrew Haesler that after deliberating for 10 hours over two days, they were unable to come to a decision, meaning the men will likely face a retrial next year.

The Crown alleged the NRL forward, 29, and his friend, Sinclair, 23, had aggravated sexual intercourse without consent in company with a then 19-year-old woman at a North Wollongong townhouse on December 9, 2018 following a night out at Mr Crown.

The men pleaded not guilty to each of the five charges and claim the threesome was consensual.

Read more: The Jack de Belin rape trial so far

The jury consisting of five women and seven men first retired to consider their decision after nearly four weeks of evidence about 10.30am last Thursday.

When they could not come to an agreement by Thursday afternoon they were sent home until Monday 9.30am, when deliberations resumed at Wollongong courthouse.

Judge Andrew Haesler received a note about 11.30am on Monday that read, "despite careful consideration of all available evidence we have been given, we are unable to reach a unanimous verdict".

He asked all 12 jurors to return to deliberations, to calmly discuss the evidence and the points of difference that had resulted in them being unable to reach a unanimous decision.

However, jurors came back in at 3.20pm and once again told Judge Haesler a decision could not be reached.

The foreperson said "absolutely not, no" when asked if the jurors could come to a majority verdict, which could be reached if 11 jurors agreed and one did not.

Judge Andrew Haesler then formally discharged the jury and thanked them for their service.

"The fact that you cannot reach a unanimous verdict for either accused or for any of the counts is sad but it happens in about one in 100 cases," he told jurors.

"Don't beat yourself up about it. You have done your best."

Judge Haelser told de Belin and Sinclair he did not have availability for a three to four week trial until August 2021 and said a court in Sydney or another location may be able to hear the trial earlier if that was what the accused wanted.

Judge Haesler adjourned the case until Wednesday for mention.

Crown prosecutor David Scully alleged the woman agreed to accompany the men from the nightclub to another nightspot after she shared a kiss with Sinclair late on December 8, 2018.

Mr Scully suggested the men diverted their tuk-tuk to an empty Gipps Street apartment belonging to de Belin's cousin, telling the woman they needed to charge their phones.

The woman claimed she initially told the men she would stay outside, but then decided to go in to use the toilet.

Mr Scully said de Belin walked into the bathroom naked and began showering while the woman was on the toilet.

De Belin allegedly walked out of the bathroom, undid her top and pushed her onto the bed before the men told her "show us your tits".

De Belin allegedly took off her shorts and underwear, forced open her legs and grabbed her by the throat and leant on her chest.

Mr Scully said the men "spurred each other on" with de Belin telling Sinclair "nice, Cal" as they simultaneously raped the woman vaginally and orally, switching multiple times, before it was alleged de Belin tried to have anal intercourse with her.

The woman told the jury she had "tears coming out of her eyes", said "no", and "felt dead and numb inside".

Both men claim the woman started kissing Sinclair before de Belin joined in and they moved to the bed where the men then had oral and vaginal sex with her.

They claimed she was moaning in pleasure, said "yes" and that it was "normal sex".

After the alleged assault, the woman ordered them an Uber and she accompanied them back into the CBD.

De Belin allegedly told the woman "here is $50 for the Uber and to keep your mouth shut".

They got out opposite Heyday nightclub on Crown Street.

The trio then walked to Fever Nightclub, where the woman could be seen on CCTV footage laughing, before they joined the queue. She told the court she was trying to put on a brave face and felt she could not get away from the men.

She left the line shortly after arriving and sent a message moments later to a friend saying "help" before she ordered an Uber and went home.

The next morning she told her work managers about the alleged assault before she went to the police station and hospital.

However, the men's lawyers suggested the men believed the woman was consenting during the threesome.

They also submitted that her evidence was unreliable, detailing several inconsistencies, and was not supported by the objective evidence of CCTV footage and telephone intercepts.

De Belin's defence lawyer David Campbell SC said during his closing remarks that his client and Sinclair had not committed a crime.

"He (de Belin) conducted himself in a way that was morally wrong. He knows that. He cheated on his partner. He knows that. He should have been more respectful. He knows that," he said.

"Whilst what happened is not something to be praised, it certainly does not for the reasons we have outlined, involve any criminal conduct."

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