Following the star’s death in Buenos Aires on October 16, aged 31, Argentinian newspaper Clarín claims his body could remain in Argentina for 10 to 15 days.
Once toxicological tests have been performed, Payne’s remains will be able to be returned to his family in the UK.
“We are supporting Liam Payne’s family and are in contact with local authorities,” the British Embassy said in a statement.
The singer fell from a third-floor balcony at the Casa Sur Hotel in Buenos Aires, and preliminary autopsy findings reported by the Daily Mirror newspaper found the result was consistent with his 10-metre fall.
Toxicological and anatomical-pathological studies of blood and urine will determine any trace of drugs.
Police found a bottle of whiskey, a lighter, and a white powder in the room, as well as medications including clonazepam - which is used to treat epilepsy, panic disorders or involuntary muscle spasms - and energy pills.
They earlier said they had been called to reports of an “aggressive man who could be under the influence of drugs or alcohol”.
Emergency services previously said Payne had died instantly.
“Our role was to head there quickly, give medical attention, and try to resuscitate him, but his injuries were incompatible with life,” Buenos Aires emergency services chief Alberto Crescenti told The Sun.
“Based on what the team saw, there was apparently a cranial fracture and extremely serious injuries that led to his immediate death.”
Audio from the two calls made by the hotel’s head of reception to emergency services also circulated online, with the employee admitting that staff were “worried” a guest’s life was at risk.
“We have a guest drunk with drugs and alcohol. When he [them, gender not clear in conversation] is conscious, he is breaking everything in the room,” the employee said in the first call.
“We have a guest who is destroying everything in his room. We need someone to come.”
After the line went dead, he called back and said: “We need you to send someone urgently because I don’t know if the guest’s life is in danger.