Mr Nanthasak, director-general of the Special Cases Litigation Office, said this was decided after the prosecutors received additional documents from a lawyer for Mr Suthep.
Mr Suthep was originally required to report to the Criminal Court on Dec 12, along with former prime minister Abhisit Vejjajiva, for formal indictment on charges of premeditated murder for ordering the crackdown on United Front for Democracy against Dictatorship (UDD) protesters in 2010.
More than 90 people died and hundreds were injured during the violent protests and subsequent crackdown by the army.
Only Mr Abhisit reported for arraignment as scheduled. Mr Suthep had requested a postponement, reasoning he was busy leading the protest by the People's Democratic Reform Committee.
Mr Nanthasak said the indictment of Mr Suthep has been rescheduled for Jan 8 at 10am.
Mr Abhisit was prime mnister at the time of the protests, and Mr Suthep deputy prime minister.
The murder charges were laid this year by the Department of Special Investigation.