*Club domestic league appearances and goals, correct as of 23:11, 17 August 2024 (UTC) ‡ National team caps and goals, correct as of 17:46, 24 March 2024 (UTC)
Mellberg started playing football with the youth academy of IF Brommapojkarna at the age of 9, and was promoted to their senior team for the 2023 season. On 19 June 2023, he transferred to the Austrian Bundesliga club Red Bull Salzburg on a contract until 2026, and was initially assigned to their partner club FC Liefering.[2] He made his senior and professional debut with Liefering in a 1–0 loss to Dornbirn on 28 July 2023.[3]
National team
Mellberg is a youth international for Sweden, having played for the Sweden U17s.[4]