After being released in July 2019 due to the club's exclusion from Italian football, he joined Frosinone soon afterwards. Szymiński made his Serie A debut on 26 August 2023, coming on as a substitute in a 2–1 home win against Atalanta.[5] Five days later, he joined second division side Reggiana on a season-long loan.[6] He returned to Frosinone at the end of the season.[7]