On 11 June 2023, Nyberg was selected to referee 2023 FIFA U-20 World Cup final between Uruguay and Italy in Argentina.

On 9 April 2024, Nyberg refereed the first leg of UEFA Champions League quarter final knockout tie between Arsenal and Bayern Munich but he was criticized by Bayern Munich's coach Thomas Tuchel for not awarding his team a penalty when opposition player Gabriel Magalhães deliberately caught a ball with his hands during normal play.

[1] In the same month, Nyberg was selected to officiate at the Men's Olympic Games football tournament in Paris.

[2] [3] The following month, he was appointed by UEFA as the fourth official for Europa Conference League final between Olympiacos and Fiorentina.

[4] At the 2024 Summer Olympics, Nyberg was assigned the opening Group B match between Argentina and Morocco.