The North London outfit lost their second game in five Premier League matches with a 1-0 defeat at White Hart Lane.
"You need to show that you are the best team," The Mirror quotes Pochettino as saying. "The way we play you put risk in your game.
"I am angry. Disappointed. We had a bad day. The team looked very nervous in the game. But the result is not fair because I think it's a draw if you analyse the game."
Spurs are currently ninth in the league table.