[2] Constantin Stancu was born on 2 October 1956 in Pitești, Romania, starting to play junior level football in 1970 at local club, Argeș.
[2][3] He started playing in European competitions in the 1978–79 UEFA Cup edition when he helped the team eliminate Panathinaikos in the first round with a 5–1 aggregate victory.
[2][3][6] In the following season they passed AEK Athens in the first round of the 1979–80 European Cup, the team being eliminated in the following one by title holders and eventual winners, Nottingham Forest.
[3] Constantin Stancu made three appearances at international level for Romania, making his debut on 1 June 1983 when coach Mircea Lucescu sent him on the field to replace Gino Iorgulescu in the 70th minute of a friendly which ended with a 1–0 loss in front of Yugoslavia.
[10] Constantin Stancu coached several clubs in Romanian football like Argeș Pitești, Chindia Târgoviște, Metalul Plopeni, Astra Ploiești, Juventus București, Muscelul Câmpulung and Mioveni.