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Heimir became Iceland's co-coach in 2013, partnering with Lars Lagerbäck to lead the national team. Their collaboration marked a significant turning point for Icelandic football, as they guided the team to their first major tournament, the 2016 UEFA European Championship, and the 2018 FIFA World Cup. Heimir's expertise and Lagerbäck's experience proved to be a winning combination, elevating Iceland's footballing status and inspiring a new generation of players.