Polonia Bytom announced that the contract of 20-year-old Polish defensive midfielder Oliwier Kwiatkowski has been extended. His new agreement is valid until June 30, 2028, and includes a clause allowing for an additional twelve months of cooperation. Tomasz Stefankiewicz, the club's sporting director, commented on the importance of the contract extension with Oliwier Kwiatkowski and praised his development. During the 2025/2026 season, Kwiatkowski has scored 6 goals and made 1 assist in 19 Betclic 1 Liga appearances. The Poland U20 international, who has 2 caps for his country, has a current market value of €350k according to Transfermarkt.