A senior member of the Muslim Brotherhood has criticised army chief Abdel-Fattah El-Sisi's call for protests against "terrorism."

"General Abdel-Fattah El-Sisi has put forward his point of view. Do not the people have the right to listen to other points of view? Is not there a sane man to advise [El-Sisi] to release the legitimate president [Mohamed Morsi] who was elected democratically in free elections?" Essam El-Erian said via Facebook.

"Millions will come out to say no to the coup leaders as they have done since 28 June. Asking for the people's help will not stop anything and if the coup had supporters they would have taken to the streets already," El-Erian added.

Egyptian army chief El-Sisi has called for protests on Friday to give the military a mandate to confront "violence and potential terrorism."

"[El-Sisi's] threats will not stop millions of people from protesting [in support of Morsi]. [He is a] coup leader who kills women, children and those praying," he added in reference to the army's killing of over 50 Morsi supporters near the Republican Guard headquarters two weeks ago.

The anti-Morsi Rebel (Tamarod) campaign has backed calls for protests on Friday to show support for the armed forces in its war against "terrorism" and to demand the trial of ousted president Mohamed Morsi.

El-Sisi's call for protests came after an alleged terrorist attack on a police station in Mansoura on Tuesday and days of street violence between supporters and opponents of the former president.