As the match gets under-way, here are tonight’s teams…

Chelsea: Cech, Ivanovic, Luiz, Terry, Cole, Ramires, Essien, Lampard, Mata, Sturridge, Drogba

Subs: Turnbull, Torres, Mikel, Malouda, Bosingwa, Kalou, Cahill

Napoli: De Sanctis, Campagnaro, Cannavaro, Aronica, Maggio, Inler, Gargano, Zuniga, Hamsik, Cavani, Lavezzi

Subs: Rosati, Dossena, Vargas, Dzemaili, Fernandez, Pandev, Britos

The first chance of the match falls to Daniel Sturridge. The young striker is fed the ball by Didier Drogba and is snapshot is firm enough, but Morgan de Sanctis got down well to save for Napoli.

All the pressure is coming from Chelsea early on. Drogba has started the game well, while the defence hasn’t given a sniff to Cavani, Lavezzi, Hamsik and company. Still, where there’s David Luiz, there’s usually some form of calamity.

Petr Cech gets down well to save a low shot from Hamsik. Napoli have woken up, and Zuniga sees his shot rebound off Luiz and away from danger.

A cross-shot from Maggio falls to the feet of Cavani, who shoots into the side netting. Napoli’s best chance after starting somewhat ‘scrapoli.’ Not our words. Witness this tweet…

This game is wide open – Gokhan Inler finds Lavezzi. The winger easily beats Ashley Cole for pace but can’t get past Cech. Then Hamsik has another low effort that Cech tips away with his fingers.

Napoli look far more likely to score now.

Zuniga takes a sensational ball from Hamsik on his chest, advances past Ivanovic and shoots over Cech’s goal. 17 minutes in and it already looks as though this is beyond Chelsea.

Meanwhile, it’s still Real Madrid 0-0 CSKA Moscow at the Bernabeu.

Mata is coming into things a bit more, prodding the ball forward to find Drogba well marshalled by the Napoli defence.

Chelsea 1-0 Napoli. Didier Drogba puts Chelsea ahead. It’s a brilliant right footed delivery from Ramires that finds the head of the Ivorian, and he arrows his effort past De Sanctis.

Chelsea almost make it 2-0! Sturridge gets free down the right and whips a brilliant cross over, but Campagnaro nicks it off the foot of Drogba.

Then, whew, breathless stuff – Inler strides out and finds Cavani, but he shoots wide of Cech’s post on the counter-attack.

Sturridge glances a Mata cross wide of the Napoli goal. This is a great game, end to end. Napoli started off the far better team but Chelsea look the more threatening side after 33 minutes.

Gonzalo Higuain has put Real Madrid ahead against CSKA Moscow, and Jose Mourinho’s side lead 2-1 on aggregate.

Back at Stamford Bridge, Andrea Dossena has come on for the injured Maggio. He played 18 times for Liverpool – very poorly, it must be said – under Rafael Benitez. Though he did score against Manchester United.

A shot by Lavezzi is deflected out for a corner. He takes it himself. It is woeful.

Frank Lampard goes into the book and Napoli have a free-kick, that they squander. The game has gone scrappy and thoughts turn to Fernando Torres. Wonder if he’ll get a chance if Chelsea are still chasing the game after 60-odd minutes? He has to score some time…

A weak cross from Drogba evades the Napoli defence until Aronica comes to the rescue, with Sturridge looming. Then, in the next wave, Luis has his shot defended by Paolo Cannavaro.

It’s half-time and a very entertaining game, for the most part.

Chuckle…

We’re back, and Chelsea need a goal. They go straight on the attack and get a corner. Lampard takes it and it’s….

Chelsea 2-0 Napoli!

John Terry with the header from the corner. Easy. The defence all went with Drogba, leaving everyone’s favourite Englishman to head his first Champions League goal this season.

Napoli have finally woken up since that goal and Chelsea have started to look a bit nervy. Ramires is punished for a foul on Zuniga, but the free-kick is wasted.

Paolo Cannavaro is booked. He’s not quite as handsome as Fabio, is he? Anyway…

Chelsea 2-1 Napoli!

Inler has pulled one back on the night for Napoli, and they have the advantage again.

Terry headed the ball out from a corner and the Swiss international seized on the ball, before unleashing a sizzling half-volley. Brilliant stuff from Inler.

Meanwhile, Cristiano Ronaldo has made it Real Madrid 2-0 CSKA Moscow. That’s one match that can’t go to extra time.

There are 60 minutes gone at Stamford Bridge. Torres is coming on for Chelsea as Sturridge shoots wide from distance. Sturridge is actually the man to go off.

Interesting fact: Torres has not scored a goal since August 1976.

Torres is immediately involved. He makes a nuisance of himself and up steps Ivanovic to shoot straight at de Sanctis. Better from Chelsea.

Great chance for Drogba! He swivels and volleys and the crowd thinks it’s in, but de Sanctis saves magnificently. Wow. This really is some game.

Dossena is booked for Napoli as Chelsea press again. Another Lampard corner but Luiz misses the header. Another corner. Terry rises but Napoli clear.

We’re 68 minutes in..

Another good chance for Napoli as Cavani plays Zuniga in. The full-back is on his wrong foot, however, and Cech saves.

Chelsea go up the other end and it’s a comedy of errors as Drogba and Terry both miss the ball, and Napoli make heavy work of clearing it.

Chelsea have a penalty after Dossena handled the ball!

Lampard to take it…

And… it’s… Chelsea 3-1 Napoli! He blasts it past de Sanctis. This is the ‘extra time’ score, with 15 minutes left in the game.

Napoli attack but they seem to be tiring. It’s set up for a Chelsea onslaught…

Both sides are going for it now. Lavezzi tries to conjure something for Napoli but there’s nobody at the end of his cross. Then Drogba, brilliant tonight, tries to start a Chelsea move. No avail.

CSKA Moscow have scored, but that won’t be relevant. They need two more.

Luiz does his best to pass it to a Napoli attacker, but they’re half asleep. Sideshow Bob = a liability.

Campagnaro fouls Drogba and Chelsea have a free-kick. Drogba himself takes it… He blasts it over.

Harrumph.

Chance! Hamsik sends a delightful ball in but it misses the head of the diminutive Lavezzi. If that had been Cavani, it would have been game over.

Gargano shoots from distance but it goes over. Two minutes remaining…

Chelsea are denied a clear penalty when Aronica fouls Drogba in the box! Wow. That was nailed on. The officials bottled it. Etc etc.

We have extra time at Stamford Bridge.

It’s such a finely balanced match, either side could make a mistake or produce something brilliant.

Hello, Paul here. I’ll be taking over for the remainder of this liveblog.

Just to confirm that in tonight’s other game, Real Madrid progressed comfortably, beating CSKA Moscow 4-1 on the night and 5-2 on aggregate.

A tired looking John Terry has just been replaced by Bosingwa, in what is Chelsea’s final substitution of the night.

GOAL FOR CHELSEA!

A pinpoint Drogba cross finds Ivanovic, who smashes into the roof of the net.

HALF TIME OF EXTRA TIME: CHELSEA 4-1 NAPOLI (agg: 5-4)

The second half is underway.

Pandev has replaced Hamsik, as Napoli look to go for broke.

David Luiz is limping at the moment. Will Chelsea be forced to finish this game with ten men?

Chelsea look relatively comfortable at the moment, with Napoli barely threatening. Famous last words, I know.

Not for the first time tonight, Drogba receives what appears to be the lightest of brushes from the Napoli defender, and still goes down as if he’d been shot, winning a free kick in the process.

Essien has slotted in at centre-half, to aid the injured Luiz.

Drogba has volleyed a Malouda cross well wide. With less than two minutes to go, that probably won’t matter.

FULL TIME: CHELSEA 4-1 NAPOLI – CHELSEA ADVANCE 5-4 ON AGGREGATE

Will this be remembered as the week where footballing veterans proved their worth? After Steven Gerrard’s hat-trick last night, it’s the old guard at Chelsea who inspired their side to victory tonight.

The lads in the RTÉ studio reckon Chelsea were right to get rid of Villas-Boas. Eamon Dunphy says he “didn’t pick his best team” in the first leg of this tie.

Right, that’s it from me. I’m off to catch the last Luas. Thanks for reading and commenting.