Allen has since found some of his best perform in recent weeks.
"Things can get taken out of perspective in the intensity of a game like the derby, and a lot of people probably wrote me off the second that game finished," he told the Mirror.
"I feel it was something that would have affected me in the past but, in all honesty, it didn't really affect me too much. I was able to look at it as one moment in one football match.
"I understood the significance of it, of course. It was a pivotal moment in a massive game and there is no hiding from that. But I understood it was a miss and it happens in football."
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