Frank Lampard has enjoyed so many giddy nights in this arena, whether they were spent hoisting the Premier League trophy as a key member of Chelsea's most imposing ever team or establishing himself as the club's all-time record goalscorer.
While remaining a star for South Korea, which he led to a gold medal - thereby earning exemption from military service - at the Asian Games in September, Son is no longer guaranteed a first-team place at Tottenham because of fierce competition up front.
The quarter-final draw pits Arsenal against Spurs, while Chelsea take on Bournemouth and Middlesbrough play Burton.
21' - OWN-GOAL! Chelsea 2-1 Derby: Dear, oh dear! Pedro and Olivier Giroud are also injury doubts while Ethan Ampadu's return to training may come too soon to feature on Wednesday.
Regardless, the Championship side still summoned the belief to equalise a second time, all neatly pinged passes down the left before the excellent Mount wriggled free to square for Waghorn, ignored by Emerson, to score. 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". Yet, as an opposition manager and even in narrow defeat, he will have purred at the performance delivered by his Derby County team in surroundings so familiar.
The Belgium global, who leads the Premier League scoring charts with seven goals in nine games this season, was not involved in Chelsea's 4-0 win over Burnley on Sunday due to a back injury sustained against Manchester United. Who goes through clear against Chelsea like we did on goal?
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Furthermore, the English midfielder has managed four goals in those two games, including a hat-trick against BATE at Stamford Bridge last week.
"Talking to the Chelsea players and some of their staff after the game, they were all praising us and saying how good we were", Lampard said after the game.
With rotation likely, Loftus-Cheek will be one of the favourites to start for Chelsea and could yet again find the net.
"It happens. If he hadn't touched that ball, [Alvaro] Morata would have scored a goal".
Frank Lampard's men continued to be fearless with the ball at their feet and pulled the visitors back on equal terms yet again through Martyn Waghorn, who got on the end of a precise low cross from Mason Mount after Derby made full use of a momentary lapse in concentration from Chelsea following a throw-in.
GK Willy Caballero, 6 - Could do nothing about either of Derby's goals, but his distribution was poor and nothing about him inspired confidence in his defenders.