Having been around the world in various youth teams as a child, in March 2009, Kosecki moved to Legia Warsaw.

After a successful loan spell, on 6 August 2016, he joined Sandhausen permanently on a two-year contract.

[5] On 24 July 2018 he signed a contract with Turkish side Adana Demirspor,[6] where he reached the promotion play-off finals, with the team losing out to Hatayspor, although he missed the finals themselves due to injury.

[7] After only 6 appearances in the 2020-21 season he left in February 2021 after terminating his contract by mutual consent.

[10] On 11 July 2022, Kosecki joined V liga side Weszło Warsaw.