Nantes returned to the Coupe de France final for the first time since 1999-2000 after Monaco's big names failed from 12 yards in a 4-2 shoot-out reverse on Wednesday.
Les Canaris have not played in French football's showpiece match since winning the cup in consecutive seasons at the turn of the century, but they can now look ahead to a date with Nice.
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Poor defending at both ends had seen Nantes and Monaco play out a 2-2 draw at the Beaujoire, with Guillermo Maripan and Myron Boadu scoring headers either side of two home goals – Djibril Sidibe's first-half own goal and then a scrappy Samuel Moutoussamy strike.
The tie was therefore settled on penalties, and Wissam Ben Yedder was denied by Remy Descamps before Aurelien Tchouameni missed the target to give Nantes a two-goal advantage they would not cede.