He will be the second military official after Major General (retd) Mehmood Durrani to serve as NSA. Durrani served as NSA during the PPP last government.
Notification regarding Janju's appointment as new NSA is expected to be issued once the premier returns from the US.
Prime Minister Nawaz Sharif is set to visit US on a four-day trip tomorrow where he will hold talks with President Barack Obama on a host of issues.
The decision to appoint Janjua as next NSA was taken during high-level consultations between Chief of Army Staff General Raheel Sharif and Prime Minister Nawaz Sharif last week.
Read More:NSA level talks: Tug of war continues
Janjua has also served as president of the National Defence University, the military's higher education institute and premier think-tank on national security matters in Pakistan.
He also worked on 'Azm-i-Nau,' a military preparedness exercise that had a particular focus on India.