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Chelsea are paying the price for selling Nemanja Matic to Manchester United in the summer, according to Ray Wilkins.
Antonio Conte is finding his second year as Blues boss much more difficult than his first, when he led the club to Premier League title glory.
Chelsea are nine points adrift of league leaders Manchester City, having lost three of their ten top-flight games this season, while they were easily beaten by Roma in the Champions League on Tuesday night.