[2][3] As a football manager Dumitrescu started his career in 1992 at Cimentul Fieni and after two good seasons he was appointed by Chindia Târgoviște.
At Chindia, together with his assistants, Vasile Silaghi and Gheorghe Păsărică, he created one of the best squads that ever played on Eugen Popescu Stadium.
Even if probably this team was not as good as Dumitrescu's generation, the promotion achieved in 1996, after 12 years of lower divisions, the style of playing and the composition of the squad, made of local players, won the heart of the supporters and gave to the club a nickname that will last for years, "Micul Ajax" (The Little Ajax).
Firstly he obtained a qualification in the UEFA Cup with FC Argeș Pitești, then two promotions in the Divizia A with Rocar București (1999) and Gaz Metan Mediaș (2001).
In 2006 after a season spent at Târgoviște, Dumitrescu moved to Albania where he had two short spells at Apolonia Fier and Besa Kavajë.