Leaders not fully in groove, insists Jose

Jose Mourinho has warned Chelsea’s Premier League rivals that the team will get even better this season despite their impressive start.

The Blues, who face Aston Villa today, dropped points for the first time last weekend in drawing at defending champions Manchester City.

Diego Costa, who has scored seven goals in five Premier League games, will return despite his ongoing hamstring trouble against Villa, with the Blues seeking a fifth victory in their sixth game.