The meeting comes amid reports that 150,000 people have been displaced from their homes in eastern Syria by jihadi fighters who captured wide areas of the eastern province of Deir el-Zour in the past weeks.
Mustafa Osso said the Syrian National Coalition will pick a replacement for its current president, Ahmad al-Jarba, in a vote expected on Tuesday. He said the top two candidates for the job are senior coalition members Hadi Bahra and Muwaffaq Nairabiyeh, who belong to Jarba's Democratic bloc.
A statement by the group said that in addition to a vote for a new president, the coalition will also elect three vice presidents, a secretary general and a political committee. The statement said the coalition will be "discussing the military changes in Syria and the region in general, and its impact on the course of revolution."
Over the past weeks, Islamic militants launched a wide offensive in eastern Syria and northern Iraq capturing large areas on both sides of the border.
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Also today, the Britain-based Syrian Observatory for Human Rights said the Islamic State group has displaced 150,000 Syrians from their homes in the eastern oil-rich province of Deir el-Zour.
The group has been on the offencive in Deir el-Zour since late April and has captured a large numbers of towns and villages in the province after intense fighting with rival rebel groups.
"We call on urgent support for the FSA with weapons and ammunition, and to avoid a humanitarian disaster that threatens our people," said Brig Gen Abdul-Ilah al-Bashir, commander of the Free Syrian army.