The Australian was livid on the touchline as his side were beaten by Chelsea by a 2-0 margin.
Postecoglou was seen screaming at his team, while he made his thoughts clear after the match.
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He stated: It is on me to fix it. We had bigger issues tonight than set pieces. We lacked belief and conviction in our game.
I don't know if it is low confidence but we are not playing with the mindset we need to play the football we want to. It wasn't good enough and I have to take responsibility for that.
When we put in a performance like we did in the first half, it meant my message wasn't getting through."