Impressive in beating Manchester United in the third round, Lampard's young side were the architects of their own downfall in London as Chelsea loanee Fikayo Tomori and Richard Keogh both put through their own net inside 21 minutes. I turned round thinking we'd got the foul, then looked back and they were in our box.
"I have nothing but great memories of this place and they thank me like that".
The lead was short lived as Mount laid on Martyn Waghorn's leveller after 27 minutes before Fabregas' victor. They were cancelled out by goals from Jack Marriott and Martyn Waghorn as Derby got back into contention in a insane opening 27 minutes.
However, Chelsea then re-returned the favour again five minutes later by overplaying the ball in their own half, losing possession and watching on as Jack Marriott raced through to score a quick equaliser...
Stephan Lichtsteiner, with his first for the club, and 18-year-old midfielder Emile Smith Rowe scored Arsenal's goals at the Emirates before Matteo Guendouzi was sent off for a second yellow card in the 56th minute.
Palestinian teens killed in Israeli strike buried in Gaza
Recent weeks have seen efforts by the United Nations and Egypt result in Qatari-funded fuel deliveries for Gaza, easing a severe electricity shortage.
Lampard added: "I'm proud of them".
West Ham pulled a goal back with a header from substitute Perez but Tottenham's Spanish striker Llorente ended the contest with a fine close-range volley from a corner 15 minutes from time.
Chelsea assistant boss Gianfranco Zola admitted the Blues' performance left plenty of room for improvement. "Not like you or like every supporter here in London or for supporters of Tottenham or Arsenal, but we are going to play against them in the Premier League or like now in the Carabao Cup and I am going to research a lot of information about this".
Chelsea are still unbeaten in competitive games this season.
Under Sarri, he has been relegated to playing in the "lesser" competitions: the Europa League and Carabao Cup.