After joining FC Wacker Innsbruck on loan in July 2021, Nitta quickly established himself as a key player for the club's reserve side, scoring 16 goals in his first 13 games. This includes a hattrick on his debut against SV Innsbruck on 24 August 2021.[2] He made his debut for the main Wacker squad in 2. Liga on 19 February 2022 against Kapfenberger SV.[3] He scored his first goal for the main Wacker squad against SK Vorwärts Steyr on the 4 March 2022, scoring in the 88th minute.[4]
On 6 July 2023, SKN St. Pölten signed a two-year contract with Nitta with the option to extend it.[5] He made his debut for the club against SKU Amstetten on the 30 September 2022.[6] He scored his first goal for the club against First Vienna FC on the 7 April 2023, scoring in the 81st minute.[7]