Oskar Pietuszewski could allegedly move to Nantes among other clubs, with a transfer possibly happening this winter. He is said to be the main dream of the club's owner, Waldemar Kita. However, Pietuszewski's agent, Mariusz Piekarski, said on the "Total Football" program on TVP Sport that Oskar will definitely stay at Jagiellonia until the end of the season. Piekarski added that no one is thinking about making any changes in the winter and that they will consider what to do next at a later time.

Sport.fr reports that FC Nantes is observing 17-year-old winger Oskar Pietuszewski from Jagiellonia Białystok, as well as his international teammate Tomasz Pieńko from Raków Częstochowa. The report also indicates that the French club, currently 15th in Ligue 1, is considering a transfer for one or both of the Polish players during the winter. However, a transfer being finalized during the season is considered unlikely unless a particularly compelling offer is presented to the representatives of the Ekstraklasa clubs. Pietuszewski, who joined Jagiellonia in July 2024, has a contract until June 2027. His market value is €8.00m, according to Transfermarkt. The Poland U-21 international has scored 4 goals in 4 appearances at that level. In addition to Nantes, other clubs linked with the player include FC Barcelona, Chelsea, and Beşiktaş.