Jurgen Klopp is wary of the threat posed by Chelsea's Diego Costa ahead of Liverpool's trip to Chelsea. Liverpool have won 4-3 at Arsenal and thrashed champions Leicester 4-1 so far this season. Friday night's trip to resurgent Chelsea represents the latest test to their upward trajectory. Elsewhere, Manchester United need a response to their 2-1 derby defeat at home to Manchester City as Jose Mourinho's men travel to Watford on Sunday, while Pep Guardiola's side are at home to Bournemouth.  Predict the results of every match in our polls. CHELSEA: An exciting, incident-packed encounter is in prospect as two lively attacks face up to two brittle defences. Diego Costa, at the peak of...
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