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Derby County stunned the football world by producing a giant-killing display to send Manchester United crashing out of the Carabao Cup third round.

Derby boss Frank Lampard was up against his former boss Jose Mourinho, but it was the younger manager who got the last laugh after a 2-2 draw that saw Derby win the game on penalties.

And now, Lampard will be up against his former side, in a fairytale draw that saw Derby drawn up against Chelsea in the fourth round of the Carabao Cup.

The Rams are in good hands under Lampard and are currently enjoying good form at the moment. Lampard’s side are unbeaten in six games and currently occupy a play-off spot in the Championship table, and they play pretty good attacking football.

However, Lampard has warned his side to improve defensively if they must get anything at Stamford Bridge.

He said: “If we don’t work hard, we will lose. [In a video analysis session] after the West Brom game, I didn’t show the players the four goals we scored.

“I showed them how much we won the ball back, because everyone collectively sprinted back, sprinted after the ball and sprinted everywhere. I get more enjoyment out of that than I did for Harry Wilson’s free kick against Manchester United.”