Interim president Adly Mansour issued a presidential decree promoting 59-year-old Sisi to the rank of Field Marshal, the highest in the military. Egypt's army rarely promotes senior officers to the rank of a field marshal.
Sisi's popularity soared after July last year, when he announced the ouster of Morsi amid nationwide mass protests against the Islamist president's troubled one-year rule.
As a result, a number of campaigns have sprung up to pressure Sisi to run for the presidency in the upcoming elections.
Mansour yesterday announced that presidential elections will be held before parliamentary polls -- an amendment to the transitional roadmap which was agreed upon by various political forces after Morsi's ouster.
Also Read
According to Mansour's decree, the Supreme Presidential Electoral Commission (SPEC) should begin procedures to hold the polls in no less than 30 days and no more than 90 days following the successful passage of the country's newly-amended constitution.
The constitution was put into effect on January 18 after a two-day referendum on January 14-15 which yielded an overwhelming 98.1 per cent majority approval of the charter.
Tens of thousands converged to Tahrir square and elsewhere in the country on Saturday to celebrate the third anniversary of the January 25 revolution that toppled Hosni Mubarak. Thousands carried banners and posters urging Sisi to run for presidency.
Before his appointment as Minister of Defence by Morsi in August 2012, Sisi had been serving as head of military intelligence since 2010.
Egypt has witnessed a steep rise in violence, with blasts now a regular occurrence, since the army toppled Morsi.
Security forces have blamed Islamist elements for a series of blasts and violence and intensified a crackdown on them.