[1][2][4][5] His first performance with The Miners was reaching the 1972 Cupa României final where coach Eugen Iordache used him all the minutes in the eventual 2–0 loss in front of Rapid București.
[2][4][5][6] Libardi eventually won the competition two years later after a 4–2 victory against Politehnica Timișoara from the 1974 final in which coach Traian Ivănescu used him the whole match, helping Jiul win the first trophy in the club's history.
[1][2][5][8][9] In May 1975, during a Jiul – Politehnica Iași home game, the wooden stand of the stadium started to burn due to a cigarette thrown into the blanket of seed husks, so Libardi together with teammates Gogu Tonca and Andrei Stocker jumped in to help the firefighters extinguish the fire.
[1][2][5][8] Petre Libardi played two games at international level for Romania, making his debut under coach Bazil Marian in a 1–1 friendly against Uruguay, which took place in Montevideo on Estadio Gran Parque Central.
[11] After he retired, Libardi worked as a manager, firstly in the Romanian lower leagues at clubs like Victoria Călan, Minerul Lupeni and Paroșeni Vulcan.