Antonescu was born on 25 March 1945 in
Constanța, Romania and began playing junior-level football in 1957 at local club Electrica, after four years moving to
Steaua București for one year. Afterwards he returned to play at senior level for his hometown team
FC Constanța, making his
Divizia A debut on 15 February 1967 under coach
Virgil Mărdărescu in a 1–0 victory against
Petrolul Ploiești, the team finishing the
season in fourth place. In his 17 seasons spent at FC Constanța, the highlights were another fourth place in the
1973–74 season and a personal record of seven goals netted in the
1976–77 season. During his years spent with
The Sailors, the team also suffered a relegation at the end of the
1977–78 season, but Antonescu stayed with the club, helping it earn promotion back to the first league three years later. In 1979 he spent a short period playing for
Șoimii Cernavodă in
Divizia C. He made his last Divizia A appearance on 24 November 1982 in Farul's 1–1 draw against
Dinamo București. ==International career==