A goal now will likely settle the tie, but it's got the feel of extra-time about it. The loud home crowd are just starting to get tense, you feel.

Three minutes left...

Six minutes left in Florence. Spurs are heading out.

Image source, Getty Images

There are 10 minutes left for Celtic to save the earth. Err, score an away goal that will give them a famous win. They have 10 men and are up against it, but very much still in it.

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Ashwin, Cambridge: A prime example of the fans pushing the players to score in Istanbul, it sounds intense in there. Learn something Premier League, too many libraries in England!!

From Mo, Manchester: People are quick to criticise Balotelli, but let's be honest what have Sturridge and Sterling done apart from waste the best chances.

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Liverpool play Manchester City at the weekend - they'll be far from tip-top condition if they have anotehr 30 minutes here.

Adam Lallana is on for the coda, replacing a tetchy Mario Balotelli. At least he didn't get sent off!

Mark:, external All part of the plan for Spurs, no extra time needed now.

Sanj:, external It really can get worse can't it! This could be another embarrassing night for the Premier League! Need Liverpool to score.

Samir Hussen:, external Great goal by Besiktas! We are paying the price for not scoring in the first half!

Phil Keane:, external Liverpool won't want extra time here, big game on Sunday. The race for fourth or the Europa League. I wonder what's our priority?

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Roberto Soldado's huge miss in the first half looks as crucial now as we thought it would prove to be. The Spaniard has a shot blocked from the left of the box as Spurs keep plugging away.

Harry Kane has the ball in the net! But he's offside. Spurs need two goals in 13 minutes.

Chelsea

Chelsea have now confirmed their 'major news', which is a shirt deal.

"Chelsea Football Club is delighted to unveil The Yokohama Rubber Company Ltd as our new Official Shirt Partner in our largest-ever commercial deal. This places Chelsea right at the top of European football, with one of the biggest shirt sponsorships ever signed.

"This partnership with one of the world's leading tyre manufacturers is for an initial term of five years and begins at the start of the 2015/16 season. It will see the Yokohama brand appearing on all of our shirts from our first team to our youth teams."

Bradley Allen
BBC Radio London summariser

"Mohamed Salah has been a threat all evening - real pace and an injection of attacking intent.

"The task now for Spurs is even greater. Fiorentina can now defend for the final 20 minutes or so. There is no need to chase it. There is just a purple block in defence."

So we are going to extra-time in Istanbul as it stands. Fifteen minutes to go...

Image source, EPA

A crisp 20-yard strike with his left foot after a precise lay off by Demba Ba sees Tolgay Arslan level the tie. Lovely curl on it too. Lots to admire.

Lots of noise followed that strike. Game on in Istanbul.

Image source, Getty Images

Time to focus on that League Cup final after all. Mohamed Salah puts Spurs on the brink of elimination but it's terrible, terrible defending from Jan Vertonghen. Vertonghen has time, you've got time, TIME! - but he is caught dithering on the ball and Salah pokes the ball home.

Take Harry Kane off again?

Bradley Allen
BBC Radio London summariser

"There is still time for Spurs. There will be chances. Fiorentina will definitely tire and fatigue at the back end of the game and we will see those convincing fitness levels that Spurs have developed over the course of this season."

What a strike! I'd make another Narnia gag if I could, as substitute Tolgay Arslan hits a mind-bender from 30 yards. Wonderful, swerving hit, a real peach but it ends up four inches wide of a diving Simon Mignolet's post. Slaven Bilic was off and away...

Celtic going out as it stands but alternatively just a goal away from a great win. With 10 men.

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Image source, Getty Images

A wall of noise as Liverpool keep the ball for an extended period. They look pretty secure still. As secure as a side whose back three contain Kolo Toure and Dejan Lovren can, to be honest.

Twenty-five minutes to go.

Here he is. Harry Kane on for Nacer Chadli.

Image source, EPA

Great chance! Fiorentina should really put a nail in Spurs' Europa League coffin as Mohamed Salah shows why Jose Mourinho let him leave Chelsea. Salah has great pace to run onto Joaquin's throughball, he gets away from the Spurs defence but his shot is really tame and Hugo Lloris saves.

Dental Mental:, external Spurs only have themselves to blame for not scoring and then for conceding. We are beating ourselves. Pathetic.

Joseph Crilley:, external If Spurs could pass the ball three yards we'd be doing alright.

Ben Goodwin:, external I've never seen a team focusing more on getting a player sent off than Besiktas on Balotelli tonight.

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Besiktas make a change as Tolgay Arslan emerges from a wardrobe to take his place in midfield. Besiktas have half an hour to save the tie.