Nils Zätterström

Malmö

On 12 March 2024, Zätterström signed a five-year contract with Malmö FF. Zätterström scored his first professional goal with Malmö FF on 19 July 2024, scoring the winning goal in a 4–3 win against IK Sirius. On 23 July 2024, Zätterström made his Champions' League debut appearance in a 4–1 win against Faroe Islands side KI Klaksvík in the 2024–25 UEFA Champions League qualifying phase. In the second leg of the next round against PAOK, Zätterström scored his first Champions' League goal, a late equaliser taking the game into extra time. During extra time, he provided an assist for teammate Anders Christiansen, who subsequently scored and won Malmö the game, taking them to the playoff phase.

Sheffield United

On 22 August 2025, Zätterström signed for EFL Championship club Sheffield United on a four-year contract for an undisclosed fee.

Loan to Genoa

On 23 January 2026, Zätterström joined Genoa on loan for the remainder of the 2025–26 season, with an option to buy included.

Loan to Raków Częstochowa

On 8 September 2026, Zätterström moved to Ekstraklasa club Raków Częstochowa on a season-long loan, with an option to make the move permanent.

On 13 March 2024, Zätterström was selected for the Sweden U21 squad. However, due to a hand injury and in need of surgery, Zätterström was replaced by Elias Olsson. Ahead of the November international break where Sweden would face Slovakia and Azerbaijan, Zätterström was called up from under-21 squad due to unavailable and injured players. On 19 November 2024, Zätterström made his debut appearance for Sweden, coming on as a late substitute for Gabriel Gudmundsson in a 6–0 win against Azerbaijan.

As of match played 24 May 2026

Zätterström's father Christian represented Sweden's national handball team in the 1970s and played professionally in France in the 1980s, after winning the domestic league with Lugi in 1980.