Last Updated: 18/09/13 9:52pm
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With Milan now just winding down the clock, Barcelona have beaten Ajax 4-0 at the Nou Camp in Group H's other game tonight.
Milan continue to knock the ball around defence comfortably as they look to see out the closing minutes.
Four minutes of additional time will be played with Milan in possession and Celtic seemingly well-beaten.
Stokes fires over from distance as he tries to rally the troops. Never anywhere near goal though in reality.
Balotelli is starting to enjoy himself, teasing Izaguirre before beating the left-back, only to eventually over-run it and see the ball go behind for a goalkick.
Celtic throwing men forward as they look to respond immediately, but the attack comes to nothing as Stokes misplaces his pass.
That goal has killed this game off and Celtic have every right to feel hard done by. They've been excellent this evening.
GOAL! Balotelli's free-kick is well saved by Forster, he palms the ball away but Muntari is there to bundle home from close range. 2-0.
Scott Brown is shown the yellow card for an incident off the ball involving Mario Balotelli. Not clear exaclty what happened but Milan now have a free-kick in a shooting position.
That's very harsh on Celtic - Zapata's strike was going well wide but it clipped the heels of Izaguirre and left Forster flat-footed with no chance.
GOAL! Milan take the lead through a Christian Zapata strike from the edge of the area. Looked to take a big deflection along the way. 1-0.
Big chance for Celtic as Stokes' curling free-kick clips the woodwork. That's the closest the Hoops have come tonight, great effort.
Pukki's got fresh legs though and he wins a free-kick off De Jong in a very good shooting position for Celtic. Stokes and Mulgrew eyeing it.
Lustig's cross is headed out for a Celtic throw by Zaccardo, the visitors are starting to tire a little here.
Substitutions for both sides as Boerrigter comes on for Matthews, while Robinho replaces Kevin Constant for the hosts.
Derk Boerrigter is recieveing instructions from the Celtic bench as he looks set to come on in the next few minutes.
Neil Lennon is looking increasingly on edge as Milan continue to pile on pressure. The home side really seem to be pushing for that opening goal now.
Celtic clear their lines after a Matri flick-on before the ball eventually goes behind for a goalkick after Van Dijk sees off pressure from Matri.
AC Milan are the ones applying the pressure now as Ambrose heads behind Emanuelson's cross for a corner.
Zaccardo fires across the face of goal after Matri's cross deflected into his path, but there's no-one there to apply the finishing touch.
On second viewing it looks like De Jong may have gotten a touch on that chance for Brown. Good pressure regardless. This game is wide open.
Celtic do break and it's Scott Brown driving forward, although he can't get enough power on his strike and Abbiati saves low down to his right.
Efe Ambrose goes into the book after cutting off Sulley Muntari. Free-kick to Milan in a shooting position. Balotelli eyes it up.
The crowd inside the San Siro seem to be getting a little restless with what they've seen so far, as whistles become increasingly audible. That won't affect Celtic though.
This game is starting to open up now as Celtic see another corner headed clear following a quick break.
Best chance of the night so far falls to Muntari who heads over from close range. Great cross from Constant down the left, he finds the former Portsmouth man unmarked at the back post where he really should have scored.
Commons almost finds a way through on goal before Mexes does well to come across and allow Abbiati to collect.
Mulgrew's corner is cleared by Muntari before confusion in the area almost allows him to get an overhead-kick away, but Mulgrew just slightly mis-times it with the ball behind him.
Samaras is caught late by De Jong and Celtic win the free-kick in a good position. The usual suspects Commons and Mulgrew stand over it but it's probably too far out for a strike on goal.
Celtic win a free-kick just past the half way line as Nocerino leaps unfairly with Samaras. Played short before Stokes is eventually dispossessed.
The corner is too high for the head of Zapata and the ball goes out for a throw-in on the opposite side.
Ambrose is forced to put the ball behind with a flying header after a number of half chances for Milan. Good defending from Celtic to block a number of shots in the build-up.
Balotelli fires over from the edge of the area after a promising attack from Milan. Should have hit the target really.
Celtic appear to be growing in confidence with Commons, Mulgrew and Samaras all starting to come into the game much more now.
Chance for Celtic following some great play from Samaras, he drives forward before watching his shot fly just wide of the post.
Brown does excellently to outmuscle Matri and win the ball back after Samaras had lost it in a potentially dangerous position.
Lustig's cross goes behind for a goalkick after another good run down the right. Bright start to the second-half for the visitors.
Mulgrew whips in his best corner of the night, finding the head of Lustig whose flick-on is blocked.
Half-chance for Celtic very early on as Mulgrew's ball finds Commons in acres of space, but he rushes his strike and skews it wide.
Depsite the scoreline, that wasn't a bad half at all. Celtic had the better of the possession, but AC Milan probably had the better of the chances. Neil Lennon will undoubtedly be encouraged by what he's seen so far and if his side can perfect their deliveries into the box, this game could be there for the taking.
The corner finds its way to Muntari on the edge of the box whose acrobatic effort is powerful but too high and it flies over.
Balotelli almost gets lucky with his strike from distance taking a huge deflection off the legs of Ambrose,with Forster clamouring across goal to palm it wide.
Matthews is finding all kinds of space down the right wing, he looks for the unmarked Stokes but Mexes intercepts and hoofs away.
Matthews sees his cross only find the arms of Abbiati following some good work from Commons to play him in. Another example of Celtic causing problems down the right.
Stokes leaves Zapata on the ground as he works his way into the box before Mexes comes across to block his strike as Celtic win another corner.
Mulgrew's left-footed delivery is nodded clear by Balotelli. Another wasted set-piece in a good position for Celtic.
Celtic win a free-kick following a De Jong handball. Mulgrew stands over it looking to cross into the box.
Balotelli is furious as Mulgrew shoves him off the ball and the referee waves play on. After a promising start, the game is becoming increasingly frustrating for him.
Zaccardo inadvertently puts the ball behind for a corner after good pressure from Izaguirre. Commons to take.
The ball finds its way to Abbiati after Lustig's delivery towards Stokes is too heavy for the striker to take under control.
Mulgrew's challenge on Matri is pulled up for a free-kick just before the halfway line, although it did look like he won the ball.
The free-kick is played short and eventually finds its way towards Nocerino who takes the ball down on his chest before firing a half-volley over the bar.
Stokes looks for Matthews but his pass is too heavy and it only finds touch. Celtic were knocking the ball around nicely prior to that.
Celtic have looked particularly impressive down both wings with Matthews and Izaguirre getting forward effectively.
Lustig looks for the overlapping run of Matthews down the right, but his searching through ball is over-hit and it rolls behind for a goalkick.
Matthews does well to dispossess Matri who was looking to get into an attacking position. Excellent defending.
Izaguirre shrugs off Nocerino, taking the ball to the byline before sitting up a cross which Mexes heads behind. Mulgrew to take the corner from the right.
Celtic have really fought their way back into the game in the last five minutes or so. They look really comfortable on the ball and dangerous in attack. Milan always a threat though.
Big chance for Milan as Matri's header is punched behind by Forster for a corner which Birsa will take.
The pressure on the Milan goal is eased as the referee pulls up Van Dijk for a foul on Muntari whilst the ball was in the air.
Muntari flicks away Mulgrew's corner before Izaguirre wins another corner on the opposite flank. Good spell for Celtic.
Commons lays off Mulgrew whose goal-bound drive is charged down and diverted behind for a corner which Mulgrew will also take from the right.
The ref thinks it came off Zapata's foot and he's given a free-kick to Celtic in the Milan area for a pass back. Seemed a strange decision.
Van Dijk does well to usher the ball behind after a few neat exchanges almost play Zaccardo into a crossing position.
Mulgrew can't quite reach Matthews' deep cross and Milan break, with Balotelli drawing a foul from Lustig just inside the Celtic half.
Milan starting to dominate possession, but Celtic have held firm in defence and reduced the hosts to shots from distance so far.
Adam Matthews storms down the right, looking to get a cross in, but he can't quite get the connection needed and Milan clear upfield.
Balotelli's strike from distance is blocked. He's looked very hungry for a goal in these early stages.
Celtic win a corner after an excellent knock-down from Stokes sees Commons try to force an opening, but Mexes is too strong.
Forster is forced into action again as he smothers Valter Birsa who was storming into the area. The goalkeeper does well to block his effort and put the ball behind for a corner.
Charlie Mulgrew trips Balotelli on the half way line. There's no card for Mulgrew but he does get a warning from the referee. Milan play the set-piece short.
Another chance on target for Milan as Zaccardo has a go from the right of the box. Forster is grateful again as it's straight at him and he can collect.
First chance of the game as Forster palms away Balotelli's goal-bound volley. Great strike from the Italian but it was right where Forster would have wanted it.
Balotelli eases past Lustig as the hosts try to mount an attack but Celtic are able to clear for a throw-in.
Kris Commons eventually takes the set-piece but he gets his ambitious effort all wrong and it balloons harmlessly over the bar. Wasted opportunity for Celtic.
The visitors win a free-kick immediately from kick-off. It's in a decent attacking position, with Commons and Mulgrew both standing over it.
Thanks to Chris Green from Huddersfield who's emailed in. He says: "As much as I want Celtic to win this evening, I just can't see it happening because Milan are a force at home. Of course, in football, anything can happen - we've see many shocks in the past. However, in order for Celtic to achieve a win, they must not allow Milan to have a good start to this match; otherwise, their chances of causing a shock could be ended sooner rather than later."
It's not quite a full-house at the San Siro, but the home fans are making plenty of noise as both teams are now on the pitch awaiting kick-off.
The teams are in the tunnel with Celtic, led out by a stern-faced Scott Brown, wearing their alternate yellow strip tonight, while AC Milan don their iconic red and black stripes.
There's around five minutes to go before proceedings get underway, any last minute predictions? Tweet me: @ryanparrish1919, or drop me an email: email@example.com.
Thanks to Jack Finlay who's emailed in saying: "AC Milan should easily win tonight, Mario Balotelli will run Van Dijk off the park. The Bhoys will have a wee bit to offer with Stokes and Samaras but not enough to trouble Milan. 3-0 to AC in my opinion."
We're around 25 minutes away from kick-off at the San Siro, in the meantime, why not whet your appetite for the game by having a read of our preview?
Speaking of odds, if you're fancying a flutter tonight, Sky Bet have a Celtic win priced at 6/1 which seems generous considering Milan's injury troubles. They also have a host of price boosts including Mario Balotelli to score first at 5/1.
It's not hard to see why Group H has been dubbed the 'Group of Death', with Barcelona and Ajax also in action tonight. Celtic are unbeaten in their last four games in all competitions and you'd imagine that Neil Lennon would be delighted if his side were to avoid defeat tonight and get their European campaign off to a positive start with the odds stacked against them.
The two sides last met back in 2007 when Milan were 1-0 winners in this fixture, although Celtic were victorious when they last hosted the tie thanks to a late Scott McDonald strike after Stephen McManus had given them the lead at Celtic Park.
This has the potential to be quite an interesting game tonight with AC Milan carrying a hefty injury list which includes the likes of Stephen El Shaarawy and Kaka, while Celtic have never won on Italian soil. Despite reaching the last 16 last season, the Hoops have suffered 22 defeats in their last 24 away Champions League outings, with their only win on the road coming at Spartak Moscow last year.
Thanks to Gerry H who's emailed in from Miami. He says: "Expect a Milan win as Celtic away from home in Europe are poorer than poor... Milan 3-0 - Balotelli 2 and Muntari."
Good evening and welcome to the live, interactive commentary of the UEFA Champions League clash between AC Milan and Celtic at the San Siro. As always, you can voice your thoughts before, during and after the game; either Tweet me: @ryanparrish1919, or drop me an email: firstname.lastname@example.org, and a selection of the best will be published.