Chelsea boss Thomas Tuchel insists they did enough to win at West Ham after Saturday's 3-2 defeat.
Thiago Silva broke the deadlock for Chelsea in the first half, heading Mason Mount's corner past Lukasz Fabianski via the inside of the post.
West Ham were gifted a chance to equalise when Edouard Mendy brought down Jarrod Bowen following a poor backpass from Jorginho, allowing Manuel Lanzini to stroke home from the penalty spot.
Bowen's low drive from the edge of the area restored parity once more before Arthur Masuaku's remarkable 87th-minute winner.
Tuchel later said: "I don't think we did a bad match, it was OK, we can win with this performance.
"It is tough to play here, we did too many individual mistakes, we did already against Manchester United and Watford and got punished - if you want a result at this level you have to minimise mistakes. We talked about it before, it's obviously not helped."
On the penalty, he said: "Everybody is involved, the pass is not the best decision, the orientation is not the best, we can save it but the decision-making is also not the best from Edu in this moment.
"We created a lot of half chances, a lot of touches in the box, but sometimes you need a bit of luck, a deflected shot or loose ball that falls to our feet. Their third one is a strange one, the two big chances they had in the first half were our mistakes.
"We could not finish it with clear and better chances, be more ruthless, we struggled also in defending some situations.
"Every loss is a bump in the road, that will not hold us back from what we demand from us but we need to play more accurate, more stable and reduce big mistakes."
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