Johannesburg [South Africa], Jan. 7 : German footballer Thomas Muller, who plays for Bayern Munich, has insisted that the English Premier League is very difficult and thus struggles of Manchester City manager Pep Guardiola in this season come as no surprise. [NK Sports] Guardiola’s team has been struggling for consistency in the ongoing tournament, although they are just seven points behind top-ranked Chelsea who suffered a 0-2 defeat at the hands of Tottenham Hotspur on Wednesday night.