 He was part of Romania's preliminary Euro 2008 squad, but missed out on the final list led by manager Victor Pițurcă.On 5 March 2010, Deac finally earned his first cap for the full side in a friendly match against Israel.In August 2017, following a six-year absence, he was selected by Christoph Daum for the 2018 FIFA World Cup qualifying matches against Armenia and Montenegro.