[1][2][3] Niculescu was born on 8 April 1943 in Vidra, Romania, starting to play junior level football in 1961 at Dinamo București.

[1][3][5][6][7] Afterwards Niculescu returned to Pitești, the team being now named Argeș and started playing in European competitions during the 1968–69 Inter-Cities Fairs Cup, appearing in both legs of the 5–3 loss on aggregate from the second round in front of Göztepe.

[1][8] In the 1971–72 season he won the league title with Argeș, but he played just one game as coaches Titus Ozon and Florin Halagian preferred Vasile Stan as first-choice goalkeeper.

[1][10][11] On 29 September 1975, Niculescu made his last Divizia a appearance in a 2–0 away loss in front of Politehnica Iași, having a total of 145 games in the competition with 216 goals conceded.

[1][3] After he ended his playing career, Niculescu worked as a coach in the Romania lower leagues for teams such as Celuloza Călărași or Dunărea Galați.