CILACAP, Indonesia (Reuters) - Indonesian authorities will execute two Australian drug convicts this week, despite a court decision to hear the pair's legal challenge to the president's denial of clemency, the Attorney General's Office said on Monday.

Australian drug traffickers Andrew Chan and Myuran Sukumaran are among a group of nine convicts to be executed by firing squad this week, said Tony Spontana, spokesman for the attorney general's office. The timing of the execution will be announced on Tuesday morning.

Earlier on Monday, a lawyer representing the pair said Indonesia's Constitutional Court has agreed to consider a last-ditch challenge by the two Australians, raising hopes their execution could be delayed.

"For the Bali Nine (pair), we have the Constitutional Court appeal, we have the registration number and we have the schedule fixed on May 12," Leonard Arpan, lawyer for Australians Myuran Sukumaran and Andrew Chan, told reporters.

"We keep hoping that this ongoing legal process will be respected."