The defender-cum-midfielder has been reflecting on Tottenham Hotspur's latest draw.
Dier scored the opening goal of the game and Belgian international Nacer Chadli doubled the hosts’ advantage on the stroke of half-time, but Tottenham manager Mauricio Pochettino would ultimately be left disappointed as the Potters fought back.
First Marko Arnautovic scored from the penalty spot and then Mame Biram Diouf equalised when he converted a cross from substitute Stephen Ireland.
Tottenham really should have put the game to bed by then given their earlier two-goal lead, and that was something Dier reflected on in his post-match interview.
“It’s really disappointing,” the England under-21 international said. “We should’ve killed the game off. It’s something we have to correct. It can't happen again. Everyone is upset."
Dier continued his role in midfield having initially played there for Tottenham during their pre-season campaign.
This time he was alongside Ryan Mason rather than Nabil Bentaleb, but for the second week running Tottenham took only a point from their match, leaving them with plenty of work to do in the weeks ahead.