Lakes State Governor expressed readiness to face the former vice-president in the court.
Sudan tribune ran an article on Friday where Riek Machar accused Matur Chut Dhuol of defaming him as being corrupt and threatened to sue the Governor to court.
Mr Matur reacted that he was on standby to get to court with Dr Machar.
He said senior officials should respect the law and not attack their subordinates.
Some state governors attacked the ex-vice president after openly criticizing party senior officials including President Salva Kiir on governance.