Pablo Sarabia's header 10 minutes from time ensured Paris Saint-Germain did just enough to beat Ligue 2 side Lorient 1-0 and book their place in the last 16 of the Coupe de France.
Thomas Tuchel's men were far from their best at Stade du Moustoir and extra-time appeared to be on the cards, but Sarabia was decisive in the 80th minute to end Lorient's hopes of an upset.
While Tuchel did use the opportunity to rest some of his key players, PSG still had an exceptionally strong starting XI – but they offered very little spark or imagination in the first half, with Lorient actually crafting the best chance.
The contest was more open after half-time, particularly in the final 20 minutes, and Sarabia produced a well-placed header late on to seal the victory, as PSG look to go one better than last season in the competition, having finished runners-up in 2018-19
Although PSG managed eight shots in the first half, there was a distinct lack of goalmouth action and the Parisians struggled to test Paul Nardi in the Lorient goal.
The only major opportunity of the opening 45 minutes fell to the home side just past the half-hour mark – Yoane Wissa heading Jimmy Cabot's cross just wide from close range.
PSG were no more of a creative threat after the interval, with Angel Di Maria, Julian Draxler and Sarabia underwhelming in their attempts to supply Mauro Icardi with good service.
Icardi was finally presented with a chance in the 67th minute, latching on to Sarabia's looping header at the back post, but Nardi just managed to get in the way when the opening goal looked a certainty.
Chances began to flow a little more in the final 15 minutes, as Thiago Silva cut out a potentially goal-bound shot from Vincent Le Goff and Nardi made a fine save to thwart Sarabia.
But the former Sevilla winger was not to be denied soon after, peeling off his marker to head home Silva's delivery.
What does it mean? PSG persist but lack of decisiveness a concern
It is not often that PSG struggle to break their opponents down. With a slightly altered supporting cast for Icardi, the Parisians often appeared short of ideas on Sunday. Perhaps it came down to a lack of focus - if so, Tuchel will need to stamp that out quickly if they are to enjoy a successful season across all fronts.
Nardi a safe pair of hands
He perhaps did not come under quite as much pressure as he might have expected, but Nardi still produced a commanding performance in Lorient's goal. His save to deny Icardi in the second half was excellent, while he looked confident when dealing with crosses and high deliveries.
Di Maria disappoints
The most experienced player in PSG's attack on the day, Di Maria certainly cannot be accused of going missing, but very little of what he did was positive. Only one of his seven shots was accurate and he produced a solitary key pass – hardly decisive.
Another cup tie awaits PSG, as they go to Reims in the Coupe de la Ligue on Wednesday. Lorient return to league action two days later as the Ligue 2 leaders host Nancy.