 He played 31 games in his first season, while also being instrumental in the Aragonese team's fourth place in 1999–2000.After the 2001–02 campaign, with Zaragoza relegated, Sundgren returned to AIK, retiring from the game in 2006 after two seasons with two modest Stockholm sides, IFK Sollentuna and FC Djursholm.Sundgren represented Sweden at UEFA Euro 2000, and played in the 0–0 draw against Turkey in the tournament.