PRIME Minister Tony Abbott has sent the Indonesian Government an "unambiguous" message, that he expects them to "reciprocate" foreign aid Australia has sent by stopping the execution of two Bali Nine ringleaders.

Mr Abbott stepped up his rhetoric on Wednesday as Indonesian Government figures indicated the death penalty for Andrew Chan and Myuran Sukumaran might be delayed until next month.

After continued pleas, Mr Abbott said Australia felt "grievously let down" by Indonesian President Joko Widodo's refusals to grant the pair clemency.

He said he felt "sick in my stomach" for the pair's execution by firing squad for their roles in a heroin drug ring 10 years ago.

Mr Abbott also cited the foreign aid Australia gave Indonesia after the Boxing Day tsunami.

"We in Australia are always there to help you and we hope that you might reciprocate in this way at this time," he said.

He said it was "right and proper" that Australia's calls were heeded.