After his loan deal expired, Niczuly totaled 19 appearances in all competitions for Universitatea Cluj in the 2015–16 campaign. In the summer of 2016, he moved to Sepsi OSK, which immediately gained promotion to the Liga I by finishing second in the league.[1] He went on to record his debut in the top tier on 16 July 2017, in a 0–1 loss to Astra Giurgiu.[2]
On 22 July 2020, Niczuly was a starter in the 0–1 loss to FCSB in the Cupa României final.[3] Two years later, he again played a Cupa României final, this time resulting in a 2–1 victory over Voluntari.[4] On 24 May 2023, he won his second successive Cupa României final, saving three penalties in the 5–4 shoot-out win against Universitatea Cluj.[5]
Personal life
Born in Târgu Secuiesc, Niczuly is of Hungarian ethnicity, which has been the source of at least one xenophobic incident with spectators in games that he appeared in.[6] In 2019, he married his partner Tania Alexia, a native of Cluj-Napoca with whom he has a son.[7]