Bali Nine ringleaders Andrew Chan and Myuran Sukumaran could face a firing squad within days after Indonesian officials sent letters ordering that preparations be made for their executions. Indonesia's head of General Crimes sent the letters to the prosecutors of 10 death row prisoners including Australians Chan and Sukumaran on Thursday. The Indonesian Attorney-General's spokesman, Tony Spontana, said the only thing left after this is to announce the execution date. The Australian Embassy has been summoned to Nusakambangan Island - where the executions will be carried out - on Saturday. Authorities in Indonesia give death row prisoners and their families 72 hours notice before they are executed, suggesting Chan and Sukumaran could face the firing squad as early as Monday or Tuesday. Scroll down for video . The execution of Bali Nine ringleaders Myuran Sukumaran and Andrew Chan got a step closer on Thursday . Time seems to be running out for Sukumaran who claims to be rehabilitated since he went to jail in 2005 . Meanwhile the lawyer for a Nigerian man scheduled for execution with Chan and Sukumaran says the embassy has been summoned to Central Java, a likely sign the date is imminent. Utomo Karim, lawyer for Raheem Salami, said on Thursday afternoon the Nigerian embassy received a letter asking it to go to Cilacap, the port closest to Nusakambangan, on Saturday. 'Based on experience from the previous execution, they're going to tell them the date for the execution,' he said. Indonesia is required to give 72 hours notice of the executions. Chan and Sukumaran are in the same cell block as Salami on Nusakambangan . Chan was arrested on April 17, 2005 in Bali for planning to smuggle 8.3kg of heroin valued at about A$4 million from Indonesia to Australia . Letters were sent by authorities to the prosecutors of all 10 death row prisoners, which includes Sukumaran, ordering them to prepare the executions . Earlier in the week Indonesian President Joko Widodo confirmed the executions were 'only a matter of time'. President Widodo told the Indonesian news agency Antara that while he would not interfere with the inmates' outstanding legal appeals, the executions would take place upon their conclusion. 'When it will be done is no longer a question,' he said.  'It is only awaiting the conclusion of all procedures and the legal process, which I will not interfere in. It is only a matter of time.' News of the letters were a huge setback for Chan and his family members . Sukumaran along with the other nine death row prisoners will be killed by firing squad . News.com reports the Attorney-General’s spokesman also indicated that of the 10 death row prisoners only one legal matter was now outstanding. The one remaining is of an Indonesian man whose judicial review is still before the Supreme Court but is expected to finalised within days. News of the letters will be a huge setback for Chan and Sukumaran and their families and lawyers, who had hoped they would be granted another legal challenge. The Attorney-General has already suggested that a Constitutional Court challenge by lawyers for Chan and Sukumaran will not be taken into account and will not delay the executions. Curently Sukumaran (pictured) and Chan remain in an isolated cell on Nusakambangan Island .
Fate of Andrew Chan and Myuran Sukumaran looks even more bleak.
The only thing left now is to announce the execution date for the pair.
It was another devastating setback for the pair and their families.
Indonesian President confirmed executions 'only a matter of time'
The pair and the other death row prisoners will be killed by firing squad.
They remain in an isolated cell on Nusakambangan Island.