He was charged with one count of murder several hours later.
During an online filing hearing of the Melbourne Magistrates Court on Thursday night, Mr Sako was not present due to technical difficulties.
The court heard that Mr Sako was in the police cells at Melbourne West police station and that it was his first time in custody.
Asked by the magistrate whether the accused had any medical or mental health issues, Mr Sako’s lawyer Sam Norton said he did not.
Detective Senior Constable Mick Drew said it would take longer than normal to serve the hand-up brief as time was needed to compile an extensive amount of CCTV footage, to prepare pathological reports and analyse mobile telecommunications records.
He also said that police needed time to forensically analyse the “sheer volume” of crime scene-related exhibits.
Police were still in the process of collecting all the relevant CCTV, he said.
Mr Sako will next face court on April 27.
Earlier this week, Ms Manno’s grieving family paid tribute to the bright, intelligent young woman.
“She was … the best of all us. She was loved by everyone – there isn’t a soul on this Earth who could ever say a bad thing,” said older brother Jayden.
Ms Manno was a team leader at her job at a Mill Park call centre run by global services company Serco. Mr Sako was one of her team members but left the company about a year ago.
Her brother Alessandro, 19, on Wednesday shared an emotional tribute to his older sister.
“You were my everything,” he said. “You and I were always inseparable and had a bond like no one could ever imagine.
“It was only two days ago when we were both making homemade pizzas together and having a great time by the pool and talking about seeing our niece tomorrow.
“I can’t believe you’re gone and I’m never gonna see you again. You were so perfect in every way and I just can’t believe this is real.”
Her boyfriend Chris Ridsdale also paid tribute to his “beautiful” partner.
“To say she was beautiful would be an understatement. It was so much more than the way she looked. Celeste was graceful, elegant, charismatic, passionate and old fashioned – a one of a kind,” he said.
“To have known Celeste was to have been blessed. Such a kind, caring and selfless soul who had an impact on everyone she came into contact with.”
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Simone is a crime reporter for The Age. Most recently she covered breaking news for The Age, and before that for The Australian in Melbourne.