BBC Sport's Alasdair Lamont at San Siro

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"Midway through the first period and Celtic are very much in this contest, which is raging from end to end. It's every bit as open as the game at Celtic Park, all we're lacking are the goals!"

Follow full commentary on events at San Siro here.

Spurs force a corner which causes panic in the home side's box, it falls for Benjamin Stambouli 18 yards out but he's blocked out by two or three Viola defenders. Fine defending.

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Liverpool's first attack of the night sees Raheem Sterling test Cenk Gonen from the edge of the box. Decent hit from Sterling, he cuts across the ball and the keeper makes a comfortable enough stop. It all came from a persistent run down the left from Alberto Moreno.

Dutch champions Ajax have taken control early on in Poland with Arkadiusz Milik, who scored the only goal of the first leg, and Nick Viergever making it 2-0 on the night against Legia Warsaw - 3-0 on aggregate.

Meanwhile, defending champions Sevilla have taken a big step towards the last 16 with Carlos Bacca bagging an away goal at Borussia Monchengladbach to make it 2-0 on aggregate.

There was a time when Mario Gomez was among the most feared strikers in Europe. That feels like a long time ago now doesn't it? The German striker has acres to run into and punish Spurs, but he has no pace, is caught up by a defender and then trips over his own feet.

Sixteen minutes of containment from Lilverpool so far. Bar a few fruity challenges involving Mario Balotelli it's been event free. Exactly what Brendan Rodgers wanted.

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Bradley Allen
BBC Radio London summariser

On Tottenham's potential penalty: "He gets nothing on the ball and I have seen them given. Spurs could have had a penalty. The official is about three yards away from the incident."

Now then, is that a penalty for Spurs?! Christian Eriksen breaks in to the box and he goes down under a challenge from ex-Manchester City defender Stefan Savic. Savic was on the wrong side and he made no contact wit the ball - a risky one.

Any time you see a defender protesting before he's even sat up, you get the feeling that it could well be a spot kick...

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Forget what I said earlier, Mario Balotelli is going to get sent-off tonight. He's just been booked for a late lunge on the touchline. That's 80 minutes on a booking. I don't rate his chances.

Bradley Allen
BBC Radio London summariser

"In transition Fiorentina are bright, they are looking to exploit the right side and get one on one situations against Vlad Chiriches.

No clear-cut chances for Fiorentina but you can see they are playing with confidence."

The hosts continue to press on, Hugo Lloris bats away a corner and David Pizarro lashes the loose ball high and wide. Fiorentina have the advantage thanks to last week's away goal. Spurs need to score tonight.

Erik Lamela has their first shot of the night, but it's straight at Neto in the Fiorentina net.

Image source, Reuters

Mario Balotelli has already been pinged for two early fouls, are the hosts trying to wind him up? Liverpool fans will be pleased to see Mario laughing at the referee after his latest infringement. Keep calm and carry on.

First shot of the night from Fiorentina as Mohamed Salah finds Milan Badelj on the edge of the box. It's crying out for a hit but he drags it wastefully wide.

Bradley Allen
BBC Radio London summariser

Image source, Reuters

"It's a real challenge for Spurs. Watching the first leg we saw Fiorentina show their quality and adapt their formation to come back strongly into the game in the second half. Spurs, regardless of any changes, are going to have to perform very well to get through this tie."

No chances yet at the San Siro, where Inter are playing in a light blue number for some reason.

You can follow full minute-by-minute commentary on that one here.

The familiar violet shirts of Fiorentina scurry hither and thither across midfield, a bold start on what looks like a freezing evening.

Besiktas make a lively start, roared on by a vociferous crowd. Kolo Toure almost gets caught on the ball but just about gets it out.

Game on! Under way in Istanbul, in Florence and in Milan.

BBC Sport's Alasdair Lamont at San Siro

"Kick-off just moments away in the San Siro, which is about half full. The 3,000 Celtic fans are up in the top tier of the cavernous stadium but are making themselves heard. Their team has to end a winless run here in Italy if they're to progress. No easy task but a challenge Ronny Deila and his players are relishing."