West Bromwich Albion manager Sam Allardyce was disappointed with his side's defensive lapses as they fell 2-0 to Tottenham away from home.
The Baggies are in the relegation zone in the Premier League, with the team currently 12 points from safety.
Allardyce knows his team must start winning quickly, and rued their inability to cut out defensive mistakes against Spurs.
"I'm still facing the same problems 10 games in and those lapses in concentration keep hurting us," he told reporters.
"Harry Kane being alone in our box amazes me but there you go. Son and Harry Kane have scored because of our weaknesses there.
"There is no lack of effort from this group of players, there is no one not trying, I can't point the finger at anyone for not giving what they have got.
"I am sick of going on about it, it means I won't be sleeping too well unfortunately. Very, very quickly we will have to start beating any team we come across.
"When we play the big teams we will have to win, that is coming across now with the last 15 games coming and we have to start against Manchester United.
"We have to beat Manchester United like Sheffield United did, like Burnley beat Liverpool, like Brighton beat Liverpool. It is going to have to happen to us very soon."
