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Chelsea's new signing Kai Havertz scored a hat-trick as the Blues thrashed Barnsley to reach the the Carabao Cup fourth round.
Tammy Abraham had put the Blues ahead with a smart finish for the hosts.
Ross Barkley and Olivier Giroud were also on target as Frank Lampard's side eased through at Stamford Bridge.
The Blues will visit either Tottenham or Leyton Orient in the next round.
Spurs' game against the League Two side was called off on Tuesday after several of the Leyton Orient squad tested positive for coronavirus.
Discussions are ongoing over the implications of not holding the third-round match on Tuesday, with a further update to be provided in due course.