That was a borderline decision. Usually the referee rules in favour of the goalkeeper in these things. But not sure Cesar Azpilicueta did too much wrong.

No VAR tonight.

Image source, Reuters

HUGE CONTROVERSY!

Chelsea defender Cesar Azpilicueta puts the ball in the back of the net and runs away to celebrate a famous winner.

But it's ruled out.

Eden Hazard's cross is held by Kevin Trapp. Azpilicueta nudges him and the keeper drops the ball onto the defender's shoulder and it ends up in the back of the net.

The referee takes a while to make clear the goal has not stood.

Davide Zappacosta almost sends Chelsea to Baku! A fierce drive from the edge of the box is tipped over the bar by Kevin Trapp. Good shot, good save.

Frankfurt break from the corner. Filip Kostic's first cross is blocked. He gets it back again and this one is also cut out.

Ross Barkley gets the ball on the edge of the box and he's crowded out by a few defenders. He still manages to find Davide Zappacosta, who wins a corner.

Both sets of physios are on now helping the two players.

Chelsea's first good chance in a while. Emerson cuts in and has a low shot saved. His follow-up effort is blocked by Martin Hinteregger and both players appear to be hurt.

Image source, Getty Images

Frankfurt break but they run out of legs and Ross Barkley wins it back.

Eden Hazard's corner is flicked away. Emerson tries a follow-up cross. Blocked.

Nice from Chelsea. Pedro finds Davide Zappacosta on the outside and the full-back's cross is put behind for a corner.

Frankfurt have only used two subs. I wonder if they're saving one for pens.

Can you walk a game on penalties?

ladele26 Ladies and gentlemen give it up for David Luiz that is once in a life time save on the line. He has to be man of the Match if Chelsea win this match

_AshWilliams83 Frankfurt deserve to win this one. Watched 45 mins and Chelsea are being sloppy with their passing.

charmingmanuk66 Frankfurt deserve to win this but Chelsea will walk it on penalties.

Pedro finds Gonzalo Higuain, but the striker's touch is heavy and the chance is gone.

For one final time, we go again.

A lot of you mischievously wondering if Maurizio Sarri might bring Willy Caballero (or try to) for penalties. But they've used all four subs (sadly).

Arsenal

Image source, Getty Images

Speaking to BT Sport, Arsenal goalkeeper Petr Cech said: "I have no preferences who we play in the final. The team who manages to get to the final always deserves it. It would be a remarkable end to my career if I play a European final against my former team."

On his performance: "With all my experience, I can compensate for the match rhythm with my preparation. The key is always how you prepare in training and I always behave the same whether I am starting or on the bench. I always feel confident I am ready to play. I enjoyed it when we scored the fourth goal because that was the moment i knew we were in the final."

On his upcoming retirement: "You have days when you play well and you think you could continue but I think I have made the decision with a lot of thought. I could possibly go another two years but I would rather retire early than too late. I wanted to do it on my terms. The last dream was to play this European final and it has come true, now the dream is to win it."

Half-time in extra time. We are 15 minutes away from penalties.

Image source, Reuters

Another goalline clearance to deny Sebastien Haller! The corner comes in, the sub gets a decent header onto the ball but Davide Zappacosta heads it away.

Corner to Frankfurt right at the end of this half. A goal from them and it's practically all over.