Career
He began his career in a local Swedish team called AIK Sillhövda (1996) and after two years he was transferred to Swedish champions IFK Göteborg. He played there until 2004, when Austria Wien bought him for €450.000. In January 2006 Panathinaikos Football Club brought him in Athens to play for them on a 2-year contract.
In the summer 2007 he moved to the Danish champions F.C. In 2011, Antonsson moved to Bologna in the Italian Serie A on a free transfer.