An agreement for a power-sharing unity government was inked in December by lawmakers from Libya's rival parliaments but neither administration has so far formally backed the UN-brokered accord.
"The parliament will meet in the coming weeks to consider an amendment to its constitutional declaration to give a vote of confidence to the national unity government," Aguila Saleh said during a visit to Cairo.
Libya has had two rival administrations since mid-2014 when a militia alliance overran Tripoli, setting up its own authority and forcing the internationally recognised parliament to flee to the country's east.
He struggled however to assert his authority as the unofficial authority in control of Tripoli said it wouldn't support Sarraj's government after initially indicating its backing.
The unity government needs the internationally recognised parliament's approval before its mandate begins.
Libya's warring rivals have come under intense international pressure to rally behind the unity government at a time when the country is grappling with a growing jihadist threat.
