A last-minute goal from Senegalese substitute Badarade Sene gave 10-man Guingamp of the second division a 2-1 win over top flight Toulouse on Wednesday and a place in the French Cup final.
Guingamp will meet Rennes, who defeated Grenoble on Tuesday, in the final.
They took the lead in the 28th minute through Dos Santos Eduardo before Andre-Pierre Gignac equalised in the 74th minute.
Richard Soumah had already been sent-off for Guingamp in the 52nd minute for a second yellow card, but the red-card only served to drive the outsiders ahead and grab the winner in the last minute.
Toulouse goalkeeper Cedric Carrasso was at fault when he failed to hold on to a stinging free-kick from Sene.
