VIDEO: Syrian Army Advancing in Sheikh Saeed in Aleppo
The London Based Syrian Observatory for Human Rights, a war monitoring group, said that rebel groups still controlled a third of the district, while government forces and allied forces had advanced and seized the rest of it.
Fierce fighting continued in the district, the Observatory said.
Aleppo has for years been divided between the government-held west and a rebel-held eastern zone, where the Syrian army and its allies have made a sweeping advance in recent days.
The Syrian government of President Bashar al-Assad fighting against an array of terrorist groups including some backed by Turkey, the United States and Persian Gulf monarchies.
A major assault by government forces backed by allied militias has driven rebels from the northern part of their eastern Aleppo enclave, where they lost a third of the area they had held for years.