On 21 September 2011, he was invited to the Iranian national team by Carlos Queiroz. He scored twice on his debut for Iran against Qatar on 29 February 2012 in a World Cup qualifier. Upon qualification to the 2014 World Cup, his next international goals came on 15 and 19 November in Asian Cup qualifying wins over Thailand and Lebanon, sealing Iran's place in the 2015 Asian Cup as well. Dejagah was named in Iran's 2014 FIFA World Cup squad by Carlos Queiroz. He started for Iran in their opening match against Nigeria, but was substituted in the 73rd minute by Alireza Jahanbakhsh. He also played 85 and 68 minutes in the next matches against Argentina and Bosnia and Herzegovina, respectively. He was called into Iran's 2015 AFC Asian Cup squad on 30 December 2014 by Carlos Queiroz.