Tottenham Hotspur head coach Mauricio Pochettino was bitterly disappointed after Sunday's 2-1 defeat at home against Newcastle United.
The Magpies scored two goals in the last 20 minutes of the game to come from behind and cause a major upset at White Hart Lane.
And the Argentinean says his players should have been more careful in defence after gifting goal-scoring opportunities to the visitors.
"The first half was fantastic, we played very well," Pochettino told Sky Sports.
"One of the best games that we have shown but in the second half, yes maybe there was a lack of competitiveness and we gave them an opportunity to score.
"We are very disappointed in the dressing room.
"It wasn't fair the final result, we need to explain the second half because it was very different to the first. It's difficult to explain now. But my feelings are disappointment, because the game is under control. You have to compete for 95 minutes. It's true that the second half we gave them chances.
"This is our 16th league game and our second defeat. It is a bad feeling but we need to work hard and look forward."
