Chelsea's new £71m signing Kai Havertz scored a hat-trick as the Blues thrashed Barnsley to reach the Carabao Cup fourth round.

It was the 21-year-old Germany international's first goals for the club after arriving from Bayer Leverkusen earlier this month.

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.

Havertz shines as Blues show off new boys

Havertz was one of only three players to keep their places from the Chelsea side beaten 2-0 by Liverpool at the weekend.

Central defender Thiago Silva was one of those brought in by Lampard as the 36-year-old former Paris St-Germain made his first appearance for the club.

The Brazilian enjoyed a relatively comfortable hour before making way, but it was Havertz who stole the limelight.

Barnsley's Cauley Woodrow had forced Willy Caballero into a fine save with a curling effort from distance early on.

But once Abraham pounced on some sloppy defending to slot past former Blues goalkeeper Brad Collins in the 19th minute, the game looked beyond the Championship side.

Havertz then latched on to Mason Mount's pass after a clever Abraham dummy and slid left-footed effort into the bottom corner to open his Chelsea account.

Barkley made it three after the break before Abraham's neat flick teed Havertz up for a simple finish inside the area.

The attacking midfielder walked in a third after beating keeper Collins to another Abraham pass, and was then replaced by another new signing in left-back Ben Chilwell.

Debutant Chilwell, who joined from Leicester City last month, swiftly offered a glimpse of why Chelsea were prepared to pay £45m for him as he whipped in a cross for Giroud to add the hosts' sixth.