Jaidon Anthony and Josh Cullen scored the goals for Burnley on the day.
Le Bris told safc.com: “I am disappointed because we lost, but we started well and the first half was good.
“We created some good chances. We didn’t score, and in a game like this, the first goal was always going to be important because it changed everything.
“It was the case at the beginning of the first half. We made a small mistake and after that the game changed. We struggled to find a solution to create rhythm in the final third.
“We have a new team, a new squad so it is a long process. We need to learn from different experiences.
“We weren’t strong enough to deal with Burnley’s challenge in the second half. We need to work more and we will have a different challenge next week.
“We need to learn and grow quickly.”