He was the Lebanese Premier League top scorer in his debut season, in 1989–90, scoring 12 goals.

[3][4] Ahead of the 2017–18 season, Al Haj was appointed head coach of Nejmeh;[5] he was fired two months later.

[2] On 12 October 2020, Al Haj was announced head coach of the Lebanon national under-23 team.

[7] On 3 August 2021, Al Haj was appointed technical director of Ahed's youth sector and remained in this position for two years.

[8] Al Hajj returned to Ahed as a head coach, in August 2024 and prior to the 2024–25 Lebanese Premier League.