A Cairo court adjourned on Saturday the trial of Muslim Brotherhood leader Mohamed El-Beltagi and Islamist preacher Safwat Hegazi to 5 October.
The pair are currently being detained on charges of kidnapping and assaulting a policeman.
Prosecution accused Beltagi and Hegazi of attempting to detain and assault a low-ranking officer, Mohamed Farouk, during a pro-Morsi march in July.
They both face other charges of inciting violence during clashes between Morsi's supporters, opponents and security forces.
Hegazy was arrested near the border with Libya on 21 August, while Beltagy was located in Giza and arrested by 29 August.
Tens of leaders of the Muslim Brotherhood are currently in detention facing an array of charges, primarily relating to 'inciting violence', following the ouster of president Mohamed Morsi on 3 July by the Egyptian military amidst mass nationwide protests.