Career
Kossoko began his career with Football Club Mantes. In summer 2008 signed for Amiens South Carolina. On 29 May 2011 signed a three years contract for AJ Auxerre. On 15 February 2013, Kossoko joined Swiss Super League side Servette.
On 28 July 2013, following a short trial period Kossoko signed for Bulgarian side CSKA Sofia on a one-year deal.
In June 2014, Kossoko went on trial with Azerbaijan Premier League side Inter Baku, but went on to sign a contract with Litex Lovech.