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.
The Belgium worldwide came off the bench at Anfield in the previous round to score a wonder goal and set up the tie with the Rams, but he will not be repeating those heroics. If this was an audition for Lampard as a future manager at Stamford Bridge, then he can't have done his chances any harm.
The Belgium worldwide suffered a back problem during Chelsea FC's 2-2 draw with bitter rivals Manchester United at Stamford Bridge last month. "The coaching they're getting is excellent".
If Derby do end up knocking out Chelsea, there would surely be different questions being asked of the club, as is the work of the fans and pundits, so it is best to leave their business alone. Lampard's new side had his old side absolutely rattled for long periods here, with Mason Mount and Tom Huddlestone outstanding.
Nicholson, who spent four years during the early 1990s at Pride Park, insisted that it is a win-win situation for both clubs if the players get the chance to play at Stamford Bridge on Wednesday. Lampard's last two Chelsea games against Fabregas were the semifinals of the 2011/12 Champions League, after Fabregas had returned to Barcelona.
Two goals from Son Heung-min and a strike from Fernando Llorente gave Tottenham a 3-1 win against West Ham while Championship side Middlesbrough upset Premier league outfit Crystal Palace 1-0.
From his appearance in the visiting dugout to his lap of appreciation after the final whistle, Derby County's manager was serenaded with chants of "Super, super Frank" and "He's won it all".
Key Stat: Chelsea (31) and Derby (30) have combined to score 61 goals in all competitions this season.
"I still believe in myself a lot and think I can add so much to this team", Fabregas said.