Cosmin Moti took over in goal after the Bulgarians' first-choice keeper had been sent off, and his resulting heroics helped to see them past Steaua Bucharest.
After substitute Wanderson scored a wonderful volley in the 90th minute to send the game to extra-time, 1-1 on aggregate, centre-half Monti was forced into goal for the shoot-out following the 119th minute dismissal of Vladislav Stoyanov.
Moti, who spent seven years playing for Dinamo Bucharest, scored the first penalty for his side and then made saves to deny Paul Pirvulescu and Cornel Rapa as Ludogorets won the shoot-out 6-5 to spark wild scenes.
