On August 14, the authorities launched a fierce crackdown on the Brotherhood following the army's July 3 ouster of Islamist president Mohamed Morsi, who hails from the group.
Top Brotherhood leaders, including its supreme guide, have been arrested, effectively decapitating the movement and disrupting its organisation.
"The decision will be announced in a few days," said Hani Mhana, spokesman for the ministry of social solidarity which has received complaints about the NGO's operations.
"The government has not taken any decision," Sherif Shawky said.
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Mhana said the NGO has been accused of involvement in several illegal activities.
"The Egyptian authorities are accusing the Muslim Brotherhood NGO of engaging in violent actions, using the headquarters (of the Brotherhood) for political activities and storing weapons in it and firing on protesters," Mhana said.
He said the authorities had given the NGO three chances to explain its position.
"But there was no response," he said.
Social Solidarity Minister Ahmed Hassan el-Boraie declined to comment to AFP, saying only: "Everything will be clarified at a press conference this week."