Spurs have since bounced back from the derby loss, though it is still front of mind for fans.
Dier told the club's website: "It hurts because it's more than a game. It does bother you a lot.
"There were sleepless nights after that game. But I believe over the course of the season, and I've said before after results like that, I still believe we're a good team and we will show that. That one game does mean a lot, but it's not all or nothing.
"It's early in the season, we have to stay calm and by 'we', I mean 'we' - we have to work together, improve together, gel together and I think we will. I think we'll get into a good place with all the players up to speed."
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