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Petr Cech admits the appointment of Mauricio Pochettino has had a massive impact on Tottenham.
Pochettino guided Tottenham to second place last season, finishing above Arsenal for the first time in 22 years.
And Spurs currently sit three places above the Gunners in third after 11 games of season.
Arsenal can pull within a point of Tottenham on Saturday when they meet at the Emirates, but defeat would see their season plunged into something of a crisis already.
And Cech thinks Tottenham made huge strides when appointing the Argentine.
“The big factor was the appointment of Mauricio Pochettino,” Cech told Sky Sports.
“You can see from his work at Southampton, he showed that he is very capable as a manager and coach.
“For me that made the biggest difference because they have young, talented players as well as experienced players, their team is very well balanced.
“There was always something missing but I would say the difference was when Pochettino came.”