Leonardo Jardim admitted it was tough going but Monaco ultimately achieved their goal of progression to the last 16 of the Coupe de France at the expense of Championnat National side FC Chambly.
Jardim rang the changes to his side and almost paid the price, before finally edging the third division team 5-4 in extra-time after the match had ended in a 3-3 stalemate.
Guido Carrillo (17), Thomas Lemar (34) and Kylian Mbappe Lottin (48) had given Monaco a commanding lead before goals from Anthony Souverbie (57) and Gregory Gendrey (81) ahead of an injury-time second from Souverbie to take the game into overtime – after Andrea Raggi was dismissed for Jardim's men.
Kevin Ndoram (96) and Kamil Glik (103) restored the Ligue 1 side's advantage ahead of what proved to be a consolation from Romain Padovani in the 111th minute.
Danijel Subasic, Djibril Sidibe, Jemerson, Tiemoue Bakayoko, Bernardo Silva and Radamel Falcao had all been rested with youngsters Pierre Nguinda and Irvin Cardona seeing game-time.
After the match Jardim said: "We achieved our objective. It was a tough match. I had to rotate my squad and the youngsters got a chance to play.
"With a lot of sacrifices, we won. We played well in the first half of extra time and that saw us through.
"We got a scare but our goals in extra time killed off the match."