Ligue 1 side Nice became the first top-flight team to crash out of the Coupe de France to lower-league opponents as they slipped up against Plabennec. Plabennec are making hard work of life in France's third tier, but pulled off a huge shock as two goals from captain Jean-Michel Abiven rendered Loic Remy's opener academic.
Their coach Franck Kerdiles, while delighted to have defeated Nice, remained realistic about their real target for the season.
"The priority is to stay up, it is vital to bring the team back down to earth for the challenge ahead," he said.
His Nice counterpart Didier Olle-Nicolle was left fuming by what he saw as a totally unprofessional performance by a team that itself is hovering just above the relegation zone.
"The worry is that certain of the senior players did not perform at all in the second-half," he said. "That is a rank lack of professionalism and highlights our mental fragility."
Holders Guingamp saw off minnows Bonchamp 2-0 with Mathieu Scarpelli and Moustapha Diallo on the scoresheet. Trelissac were no match for Marseille, as Hatem Ben Arfa and Bruno Cheyrou both netted to secure a 2-0 victory.
Ligue 2 Angers are also in the hat for the last 32 after a 1-0 win away to Lattes, while Versailles were beaten 3-0 by Beauvais.
