Mauricio Pochettino was concerned by the ease at which Tottenham conceded chances to Newcastle United in Sunday’s defeat at White Hart Lane.
Tottenham had not been beaten in the league since their opening match at Manchester United in August and a win would have seen them go above Louis van Gaal’s side into fourth place.
However, despite taking the lead though Eric Dier in the first half, Spurs fell to a 2-1 defeat to Newcastle as Aleksandar Mitrovic and Ayoze Perez both scored after coming on as substitutes.
Pochettino said: “One nil up always gives the opponents the chance to come back into the game.
“We lost concentration and made easy mistakes, we started to give the opponents the belief they can win the game.
“The chances that we conceded were easy for Newcastle; we need to analyse the game.
“Our first half was fantastic and our second half we need to analyse – I want to see the game again.”
The Argentine is not worried about his team’s ability despite the result, and believes they still have what it takes after boos were heard echoing around White Hart Lane at the final whistle.
He added: “(Am I) concerned? No. In football you can always improve.
“After the first half we were happy in the stadium, but in the second half it was not the same; it was a bad night for us.”
Tottenham have one of the youngest teams in the Premier League with the likes of Harry Kane, Dele Alli and Dier all under 23.
Pochettino has fielded the youngest side in the division this season, but he does not believe that their age has anything to do with the loss to Newcastle.
“If you want to play for the top the pressure is top, but it is not about the age, the first half was one of the best we have played, we are disappointed in the end result,” he added.