The mid-table side gave a tough test and the champions' coach conceded that his goalkeeper was vital to a 2-0 win.
Paris Saint-Germain head coach Unai Emery praised Kevin Trapp after the goalkeeper's fine showing in the 2-0 Ligue 1 win over Angers.
Reigning champions PSG pulled level with Monaco at the top of the table thanks to a brace from Angel Di Maria – the Argentina star's first coming before the half hour courtesy of a sumptuous free-kick.
It stood as a rare demonstration of quality in an unconvincing display from PSG, with their hosts regularly pushing them onto the back foot.