These Gulf countries were at odds with Morsi and his Muslim Brotherhood group.
Abu Basha said another Qatari deposit is due to expire next month, and will likely cause a similar drop in foreign reserves.
"The whole external position is based on foreign support" from the Gulf countries, said Abu Basha. "That is what is keeping us comfortable...and you know it will keep coming."
Another $5 billion is pledged from Saudi Arabia, Kuwait and Emirates, he said, but it is not clear when it will be delivered.
In June, reserves stood at just $14.9 billion, less than half of what they were before the political upheaval that hit the country following the uprising against longtime autocrat Hosni Mubarak in 2011. Since then, deteriorating security and political instability have scared away foreign investors and tourists hurting major foreign currency earners.
The current government has also promised to pay foreign oil companies $1.5 billion, nearly a quarter of arrears it owes them, by the end of the fiscal year 2013-2014. It is not clear how much of the sum will come from the Central Bank. Government officials said they will likely begin paying them this month.