He was named on the bench for Southend's FA Cup third-round game against Chelsea at Stamford Bridge and replaced Jean-François Christophe in the 74th minute.

Moussa scored his first professional goal on 21 February 2009 against Colchester after running half the length of the pitch to volley in Theo Robinson's cross.

Moussa chose not to remain at Southend after their relegation to League Two, and on 13 August 2010 he signed for Leicester City on a two-year contract.

[9] On 21 September 2012, Moussa signed a short-term contract with Coventry City and made first appearance against Arsenal in the League Cup.

Moussa made his 50th appearance for the Sky Blues during the 4–0 win against Carlisle United where he scored another solo effort.

[13] On 1 February 2016, his contract was terminated by mutual consent after an injury hit time at the south east London-based club.

[17] Having been without a club since leaving Walsall in the summer of 2017, on 23 January 2018 Moussa signed for League One side Gillingham on a contract until the end of the season.