After his young years at Apt (1994–1996) and Cavaillon (1996–1997), he became a famous figure as a RC Toulon player (1997–2000), where he won the Cup of France Frantz Reichel, in 1998. He moved to RC Narbonne (2000–2003), and latter to Tarbes Pyrénées Rugby (2003–2004) and to FC Auch (2004–2005). After a season at FC Barcelona, in Spain (2005–2006), he moved back to France, where he played for Blagnac SCR. He played for the Doncaster Knights, in England, in 2008/09. He returned to France, playing for Le Bugue AC, in 2009/10. He played for AS Mâcon, from 2010/11 to 2011/12, and currently plays for AGDE, since the 2012/13 season.
Allam was capped for the France U-21 squad, winning the Six Nations Tournament of that category with them in 2000. A few years later, Allam switched alliance and chose the country of his grandparents to represent in senior fixtures. He was a member of the historical unofficial first game of Algeria, on the 24th February 2007, as well as the official first match for Algeria on the 18th December since creating the Algerian rugby federation a month earlier. This significant match was also the first rugby international played on Algerian soil which was televised.