Le Fée converted from the spot after Brian Brobbey won a penalty, securing three important points at the Stadium of Light and lifting Sunderland off the bottom of the Premier League table.
The Frenchman said the performance reflected the togetherness that had helped the Black Cats succeed the previous season, with the players and supporters united throughout the contest.
“Like I said before the game, it was really important for us to get back to our principles. I think the way we fight, we were together. Not only the players, the fans. It was amazing,” he said.
“The game looked more like last year, we can see this afternoon that we are a family, and this is the most important thing.”
Le Fée acknowledged that Sunderland had not produced their best football in recent matches, but felt returning to their principles was more important than the style of the performance against Chelsea.
“I think after Leeds and Brentford games, we felt that we were in a good way, but after that we had two tough games. It wasn't the best game we've had in terms of football, but we came back to our principles. This is the most important thing,” he said.
The midfielder also stressed that the victory did not remove the challenge facing Sunderland, with the fight for Premier League survival still requiring a sustained effort.
“We have to be together, and I think today was the case. Of course, it's not easy, but the season is long. We still need around another 32 points to be safe, we have to fight,” he said.
“We know the league is relentless, we try our best.”
The timing of the result was particularly important, with Sunderland now able to use the international break to recover before returning to action.
“To take three points against Chelsea at home ahead of the international break, for the confidence it is top,” Le Fée added.
The win also maintained Sunderland’s perfect Premier League record against Chelsea since returning to the division in 2025. They will next travel to face Aston Villa on November 21, with Le Fée hoping the performance can provide a platform for the weeks ahead.