Spurs were beaten in a game where Postecologu let loose on the state of the club in the aftermath.
However on Friday, he said: "Not in two days, mate, no.
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"I think, as I said at the time, we have some work to do. It is clear and evident and that is what we need to focus on.
"I have been determined from day one. Nothing has changed. I haven't been deterred, if that's what people are worried about.
"When you accept the role you accept what comes with it. Nothing has changed in terms of how we go about that. But you have to know where you are at."