Chelsea reached the Champions League quarter-finals after a thrilling 4-1 extra-time win against Napoli at Stamford Bridge gave them a 5-4 aggregate triumph.
The Blues came into the return leg on the back of a 3-1 defeat in Italy and took a first-half lead through Didier Drogba.
Chelsea doubled their advantage two minutes into the second period thanks to a John Terry header, which would have been enough to put the home side through on away goals.
The tie turned back Napoli's way after Gokhan Inler netted eight minutes later, although Frank Lampard struck from the spot to force extra-time in which Branislav Ivanovic hit a 105th-minute winner.
Chelsea captain Terry had spoken before the game of how it could become one of the club's great nights.
And he said on ITV1 afterwards: "This could top them all for sure.
"The lads put in a great display, really solid, really resilient, with the firepower going forward.
"We proved we're a team tonight. That desire, that togetherness.
"We showed what Chelsea are made of tonight."
Chelsea sacked manager Andre Villas-Boas between the two matches against Napoli, with Roberto Di Matteo taking over on an interim basis for the rest of the season.
The Italian celebrated a famous win and can now look forward to a quarter-final tie, possibly against one of European football's biggest names, with the likes of Barcelona, Real Madrid, Bayern Munich and AC Milan still in the competition.
Di Matteo said: "It was a fantastic game, to watch as well.
"We knew it would take a lot to go through, the performance of the whole team tonight was outstanding."
Lampard has no doubt Chelsea can be competitive against the best in Europe, with the draw for the last eight taking place on Friday.
"We're just happy to be in the hat," he said.
"We'll enjoy tonight and wait and see. If we play with that ability and desire we can take on anybody."
Lampard saluted Ivanovic for his thunderous winning strike.
"He finished it unbelievably, like a striker really," said Lampard.
"He deserved that, he was fantastic tonight and was a symbol of the determination we showed the way he played.
"It was important we showed a desire and spirit to keep ourselves in the competition. It's been a difficult season but a performance like that tonight can change things for us so it's important we go on from here."