Haidar was born in Drammen, Norway and grew up in the capital Oslo,[3] where he lived in the Klemetsrud [no] neighborhood.

[5] He signed a professional contract with the club in 2008,[citation needed] making his debut against Lyn on 15 September as a substitute.

[citation needed] After the promotion was secured, Haidar was released from his contract and free to find himself a new club.

[citation needed] Haidar scored his first goal for Lebanon in the 2012 WAFF Championship match against Oman on 8 December 2012 when his team won 1–0.

[16] In December 2018, Haidar was called up for the 2019 AFC Asian Cup squad;[2] he played against North Korea in a 4–1 win, coming on as a 77th-minute substitute.

[17] An all-round midfielder, Haidar is not only a physical presence on the pitch but also has good ball control.