Popescu has currently 41 caps for Romania, with 5 tries scored, 25 points in aggregate. His first cap was at a 4 October 1997, in an 83–18 win over Belgium, in Brussels, in a 1999 Rugby World Cup qualifier, aged only 20 years old. He was a member of Romania squad at the 2003 Rugby World Cup, playing in four games, and at the 2007 Rugby World Cup, playing in two matches.