The rebel Free Syrian Army (FSA) has appointed Abd al-Ilah al-Bashir as its new military chief, replacing Salim Idris.

In a video statement posted online Monday, the FSA announced the expulsion of Idris and the appointment of al-Bashir. Both are defectors from the Syrian regular army.

The statement said the new appointment came against the backdrop of the "tough times facing the Syrian revolution" and aims to "re-shape the construction of the (FSA) leadership."

Al-Bashir defected in 2012. His son was reportedly killed earlier this year in battles against government troops.

Largely eclipsed by the growing power of the radical al-Qaida- inspired groups, FSA fighters are projecting themselves as moderates who seek democracy.