Antonescu played 13 games for Romania making his debut on 29 October 1972 under coach Angelo Niculescu in a 2–0 home victory against Albania at the 1974 World Cup qualifiers in which he appeared in a total of five matches, including Romania's biggest ever victory, a 9–0 against Finland.
Antonescu played 13 games for the Romanian national team, making his debut on October 29, 1972, under coach Angelo Niculescu against Albania in a World Cup qualifier match that ended 2-0 in favor of Romania. He appeared in five matches, including Romania's record victory against Finland with a score of 9-0.