[2][5][6] Constantin Radu also known as "Tache" or "Burtilă" was born on 5 January 1945 in Pitești, Romania and he started to play junior level football at local club, Argeș, after his talent was noticed by coach Leonte Ianovschi.
[3][2][7][8] He started playing senior level football for Argeș in 1964, aged 18 when he made his Divizia A debut on 15 November in a 1–1 with Petrolul Ploiești.
[3][2][7][8][9] At the end of his first season, the team reached the 1965 Cupa României final, however coach Virgil Mărdărescu did not use him in the eventual 2–1 loss in front of Știința Cluj.
[3][2][7][8][16] Constantin Radu played three friendly games at international level for Romania, making his debut on 7 December 1966 when coach Ilie Oană sent him on the field in the 62nd minute in order to replace Mircea Lucescu in a 2–1 away victory against Israel.
[17][19][20] After he ended his playing career, Radu coached teams in the Romanian lower leagues such as Unirea Drăgășani and also worked at the youth center of Argeș Pitești.