Frank Lampard has said that he is disappointed that his Derby side were knocked out of the Carabao Cup by his former side Chelsea.
The lead was short lived as Mount laid on Martyn Waghorn's leveller after 27 minutes before Fabregas' victor.
Former Arsenal captain Cesc Fabregas scored the winning goal for Chelsea in the 41st minute after receiving a nice pass from Davide Zappacosta for the Blues to win the match 3-2. Sat up all afternoon staring at the ceiling. (I was) nervous and excited.
Lampard spent time on the Stamford Bridge field after final whistle, applauding Chelsea's fans and getting plenty of cheers in return.
They gave a good account of themselves in a breathless and evenly-matched first half, bouncing back from own goals by Fikayo Tomori and Richard Keogh to equalise twice through Jack Marriott and Martyn Waghorn.More news: Whoops! Mike Pence's Hollywood Slam Backfires In 'The Hollywood Of The South'
Still, the visitor was just as unsafe going forward as it was in its own box and snatched a second equaliser after 27 minutes, Mount squaring for a Waghorn tap-in.
Lewis Wing grabbed the only goal in first-half injury time with a swerving shot from long range.
Lampard added: "I'm proud of them".
Chelsea assistant boss Gianfranco Zola admitted the Blues' performance left plenty of room for improvement.
"More than a little bit [shaky], to be honest". "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".
Derby have not won in any of their previous eight visits to Stamford Bridge and will have to pull off a herculean task if they are to come away with something in the end.