Asaduzzaman Khan Kamal told bdnews24.com at around 10pm that their mercy pleas had been rejected.
“So there is no obstacle,” he said.
Sources, earlier, confirmed to bdnews24.com that President Md Abdul Hamid rejected the pleas at about 9.30pm on Saturday, hours after the two war criminals had sought presidential clemency for their crimes against humanity in 1971.
Correspondents say security measures have been beefed up in and around Dhaka Central Jail, where they will be hanged.
Family members went there to meet them.
The two are the first death-row war-crime convicts to seek mercy from the head of state.
The war criminals executed earlier -- Abdul Quader Molla and Mohammad Kamaruzzaman -- had declined to do so.