She is a former graduate of the women's section of the Clairefontaine academy and plays as a defender.
After her stint at Clairefontaine, Casseleux joined Soyaux and had two solid seasons before joining her current club in 2005.
Her form at Soyaux also led to her being called up to the France women's team.
Casseleux made her national team debut on 14 September 2003 in a friendly against Japan.
As an under-19 international she won the 2003 U-19 European Championship.