Mauricio Pochettino has told Chelsea’s players they need to be more naughty if they are to reach the level required to move on from an indifferent start to the season. The team have dominated for long periods in all four Premier League games so far but defensive errors and a continued lack of penetration in attack have meant they have picked up just four points and sit 12th. Defeat at home to Nottingham Forest before the international break was a microcosm of the side’s early struggles under Pochettino, with the visitors’ Anthony Elanga allowed to run freely through the heart of Chelsea’s defence to score the game’s only goal before striker Nicolas Jackson skied a gilt-edged chance to rescue a point.