"We need to be more nasty in the last third. We need to be more clinical," Pochettino told BBC Match of the Day. "It's a very young group who need to improve in this area more than any other."
He added at a press conference: "I think the analysis of the defeat is clear because after the first half we should score and we didn't score. It is easy when you dominate and create chances and you don't concede chances and the opponent doesn't cross the halfway line. I think you should score. If you don't score you need to blame yourself and we are going to blame ourselves because we were not nasty or clinical in front of the goal. We created chances but did not score.
"Sometimes you need some luck, you know, to score and after the game changed in the second half but I think we give the belief because we didn't score and the second half, I think we cannot concede these types of goals. It was our mistake. That is why we lose the game."