[3] In summer 2012, following his release by Auxerre, he trialled with English clubs Crystal Palace, Barnsley, and Bristol City.

[5] On 28 July 2013, following a short trial period, Kossoko signed for Bulgarian side CSKA Sofia on a one-year deal.

[6] In June 2014, Kossoko went on trial with Azerbaijan Premier League side Inter Baku,[7] but went on to sign a contract with Litex Lovech.

[16][17] On 29 June 2017, Kossoko scored twice for the 3–1 away win over Partizani Tirana in the 1st qualifying round of UEFA Europa League.

[21] He scored his first official goal for Al-Fujairah on 5 September 2018, in a 5–2 loss against Al Jazira in a league cup match.