Mason Mount was "awful" against Tottenham, according to Frank Leboeuf, who has warned Chelsea that "some players have to wake up if they want to have a career".
Chelsea missed out on a place in the quarter-finals of the Carabao Cup after being beaten on penalties by Tottenham in the round of 16 on Tuesday night.
Frank Lampard saw his side gain an early lead when Timo Werner fired in his first goal for the club since his £47.5 million ($61m) move from RB Leipzig, but Spurs hit back deep into the second half via an Eric Lamela strike.