Career
Moussa was the bronze medallist at both the 2002 Asian Games and the 2007 Military World Games. His personal best of 7730 points is the Qatari national record for the decathlon. He competed at the 2000 World Junior Championships in Athletics, only managing thirteenth place, and missed the 2001 season.
He returned to action in 2002 and established himself at the continental events.
The peak of his season came at the 2002 Asian Games where he set a Qatari national record of 7683 points to take the bronze medal behind Qi Haifeng and Dmitriy Karpov. At the 2004 Mehrkampf-Meeting Ratingen he came sixth with a personal best score of 7730 points.
This was enough to qualify him for the 2004 Olympic decathlon. However, he did not complete the Olympic event after failing to finish in the 110 metres hurdles.
He was absent from competition in 2005.
Moussa set a heptathlon best of 4651 points at the 2006 Asian Indoor Athletics Championships, but this was not enough to reach the podium. He also missed out on the medals at the 2006 Asian Games in Doha, as his score of 7445 points left him in fourth place behind Kim Kun-Woo. Despite the disappointment of failing to medal on home soil, he went on to have on of his most successful seasons in 2007.
At the 2007 Asian Athletics Championships, he edged Iran"s Hadi Sepehrzad out of first place in the final 1500 metres event to claim his second Asian title.