He won eight caps for the Sweden national team between 1999 and 2002, and represented his country at UEFA Euro 2000 and the 2002 FIFA World Cup.
[7][8] At the time, Arsenal were playing their home European games at Wembley Stadium, giving Antonelius a run out at the famous ground.
[14] Antonelius made his full international debut for the Sweden national team on 18 August 1999, in a friendly 0–0 draw with Austria.
He made his competitive international debut for Sweden against Italy at UEFA Euro 2000, playing for 75 minutes before being replaced by Kennet Andersson in a 1–2 loss.
[16][17] He won his eight and final cap on 12 October 2002 in a UEFA Euro 2004 qualifier against Hungary, playing for 67 minutes before being replaced by Mattias Jonson.