He has played for the Iranian national team since 2011, helping them qualify for the 2014 World Cup, 2015 Asian Cup and the 2018 FIFA World Cup, although he did not play in the last. In 2015, Dejagah was voted by fans on Navad as Iran's best ever left midfielder. Dejagah made his professional debut for Hertha BSC in the 2004–05 Bundesliga season. In 2007, he joined VfL Wolfsburg, winning the Bundesliga in the 2008–09 season. In 2012, he joined Premier League side Fulham on a €2.5 million three-year deal.