Koziello is a youth exponent from
OGC Nice. He made his
Ligue 1 debut on 1 November 2014 against
Olympique Lyonnais, replacing
Grégoire Puel after 72 minutes in a 1–3 home defeat. In January 2018, he joined
Bundesliga side
1. FC Köln on a -year contract until 2022. The transfer paid to Nice was reported as €3.3 million plus potential bonuses. On 28 April 2018, he came off the bench as Köln lost 3–2 to
SC Freiburg which confirmed Köln’s relegation from the Bundesliga. On 11 January 2023, Koziello was loaned by
Virton. On 12 March 2025, it was announced that Koziello joined Nepalese club
Kathmandu Rayzrs. ==Personal life==