Career
He made his Liga I debut on 11 March 2013 in a match against Gloria Bistrița. On 19 March 2011, CS Flacăra Faget signed Sergiu Popovici from youth club LPS Banatul where he spent 7 years, before moving to Vaslui on 25 January 2012. Club leaders expressed excitement about his signing.
On 17 August 2012, Sergiu Popovici, along with Razvan Neagu and Valter Heil, was loaned out to Vointa Sibiu, but returned to Vaslui a few months later when the club folded.
Popovici made his first appearance for the Romanian U-19 against Italy U-19 in Union of European Football Associations U-19 Championship qualifying, coming on as a substitute in the 87th minute. The score ended 2-1 for Romania.
Vaslui
Liga 1
Runner-up: 2011-2012.