Aït-Fana made his professional football debut on 12 May 2006, the final match day of the 2005–06 season, coming on as a late-match substitute playing nine minutes in a 1–0 loss to Le Havre.

Montpellier earned promotion to Ligue 1 following the club's successful campaign during the 2008–09 season with Aït-Fana having an influential role.

He scored a career-high six goals during the campaign including the winner against Guingamp late in the season with the club in the midst of a promotion battle.

In Montpellier's last home game of the 2011–12 campaign, Aït-Fana scored a last minute goal in a 1–0 win over Lille after coming off the bench.

[9] After not representing France for over a year and a half, it was speculated that he would follow in the footsteps on fellow French-born Moroccan Marouane Chamakh and play for Morocco, his country of origin.

[12] Aït-Fana made his debut with the national team of Morocco in a friendly match against Senegal held on 25 May in Marrakech.