Thanks for following every kick from a remarkable night at Celtic Park. Hope you enjoyed the match as much as I did. See you in the knockout phase next year!
It's all over in the Nou Camp - and it's all over in Glasgow! Celtic reach the last-16 of the Champions League!!
McGeady barges over Samaras to hand Celtic a free-kick around 25 yards out. Nearly there Celtic fans!
Samaras and Mulgrew are holding off the Spartak defence as they manage to keep the ball near the corner flag for over a minute.
Neil Lennon is chomping hard on his chewing gum as Samaras holds the ball up at the Spartak corner flag. I'm sure he won't be the only one.
Samaras thumps forward to Lassad as Celtic try to hold on to the ball for as long as possible.
Five minutes of stoppage time will also be played in Glasgow.
There's a lengthy stoppage at Celtic Park as goalscorer Commons is taken off the pitch on a stretcher.
Barcelona are also down to 10 men as Messi goes off injured with all three subs on. And there's five minutes of stoppage time at the Nou Camp. Nervy final few moments ahead.
Kallstrom receives his second yellow card as he catches Commons with a high boot in what looked to be a painful area around the groin.
McGeady goes into the book for a rash challenge.
Nervous moment for Forster who horribly slices Wilson's backpass, but escapes with only a red face and not a costly error.
Skipper Scott Brown goes off to be replaced by Joe Ledley as Celtic look to see things out.
I've got to say I think Samaras tumbled rather easily under Suchy's challenge. But the majority of Celtic Park does not care.
The pendulum swings back in Celtic's favour after that goal. They are just eight minutes away from progressing to the last-16.
GOAL!!! Celtic Park goes absolutely nuts as Commons thumps in the spotkick off the crossbar.
Oh. My. Word. Something could be about to give at Celtic Park as Samaras goes down under a challenge from Suchy.
Still goalless at the Nou Camp - is something going to give?
CHANCE! Lassad earns another Celtic corner, which is firmly met by Mulgrew. And it takes an acrobatic save from Pesiakov to push the ball over the bar. So close.
Emineke peels off to the left flank and plays into the feet of Dzyuba inside the home area. But Celtic breathe a sigh of relief as his heavy touch sends the ball onto his hand and Celtic get the free kick.
But then there is dismay as the set-piece is wasted and Spartak break.
Celtic Park roars on their heroes as Kombarov clatters Commons to earn the match's third booking.
Another change for Celtic as Neil Lennon goes for the win. Kayal trudges off to be replaced by Lassad. Can he become a hero?
Mulgrew's corner is cleared by Spartak for another set-piece. And the second is met by the head of Ambrose whose effort hits the wrong side of the side-netting.
Lustig picks up a knock and cannot continue, so he is replaced by Matthews.
Hooper chases down a seemingly lost cause but his pressure panicks Pesiakov and the Spartak keeper concedes a corner.
Still no sign of a goal at the Nou Camp, despite Messi's recent arrival. One goal for either Celtic or Barcelona will change EVERYTHING!
Dzyuba threads a pass through the Celtic defence to Emenike but he is barged away from goal as the attack breaks down.
Neil Lennon looks very worried as he sits on the Celtic bench contemplating a tactical change.
Celtic win a corner as Celtic Park finds its collective voice again. But Commons' ball is collected comfortably, once again, by Pesiakov.
Emenike uses his power to burst forward and, with a team-mate in support, decides to go alone. That allows Ambrose to close down the space and block his ambitious shot.
Spartak looking comfortable in possession as their defenders knock the ball around with Celtic toiling.
James McGrogan via email: "Celtic definitely need a goal! Just need a little luck...and perhaps Barca can do them a favour. But, hate to say it, they should have finished it off against Benefica!!"
Here is the 26-year-old winger who replaces Spartak's goalscorer Ari. He's not going to kill the Champions League hopes of his boyhood heroes, is he?
With half an hour to go, ex-Bhoy Aiden McGeady is preparing to come on.
A hanging cross from the Spartak left looks for goalscorer Ari, but Izaguirre heads away the danger.
Two Commons crosses from the right are cleared in quick succession as Celtic look for a breakthrough.
Bit of news from Nou Camp - but it is not a goal. Lionel Messi is preparing to come on for Barcelona, so it is good news for Celtic fans.
Kallstrom, who was the victim as Lustig was booked moments ago, joins his fellow Swede in the referee's notepad.
Tricky wing play by Dzyuba who nutmegs Izaguirre to race clear down the right. However, his delivery fails to match the standard of the build up and Celtic clear.
William Condron via email: "I can see Celtic rising to the occasion and scrapping this one with a late winner from Samaras. Come on the Hoops."
Great play by Samaras who storms into the Spartak box from the left before his cross is hacked clear.
Lustig offers his apologies as Kallstrom receives plenty of treatment to the frustration of the home crowd.
Lustig is the first player to go into the referee's notebook as slides dangerously into Swedish compatriot Kallstrom.
CHANCE! Samaras cracks the Spartak post with a fierce volley from Lustig's cross.
Alan Anderson via email: "They need to forget what's happening in Spain or that Barca are fielding their under-12s side. Scott Brown needs to do better and stop Kallstrom and Lennon has to get someone on Emenike. Take Commons off and bolster the midfield."
Another Celtic break from the right as Commons flies forward, but his fierce shot is blocked by a Spartak body. Encouraging start for the home team.
Slick interchange between Brown and Hooper opens up the Spartak defence. But the skipper can only tamely shoot with his left foot as Insaurralde clears.
Celtic win a free-kick in a dangerous position on the right as Brown is blocked. Commons delivers but Spartak's Insaurralde thumps clear with his head.
We're back underway as Spartak start the second half. Hold on tight - it's going to be a hell of a 45-minute ride.
How do you see the second-half going? Can Celtic grab a winner? Will they need one or can an understrength Barca beat Benfica meaning a draw will suffice? Let me know by emailing email@example.com or via Twitter @J_Jurejko.
Unfortunately not as Mulgrew's short free-kick is eventually pumped into the Spartak box and cleared. That's it as referee Felix Brych blows time on an exciting first-half.
Free kick for Celtic - is this a chance to retake the lead before the break?
Tense mood around Celtic Park again as the home fans know Benfica are still deadlocked at Barcelona - which means Celtic would be eliminated.
Celtic try to hit back immediately and win a corner, which is gathered comfortably by Pesiakov.
That man Emenike powers through the Celtic defence, who are simply bouncing off him, before threading in Ari inside the area. His delicate, angled chip goes over a stranded Forster and goes in despite the best efforts of Wilson. Fantastic goal.
GOAL! Spartak are threatening to spoil the party as Ari equalises.
Kallstrom's set-piece is lifted into the Celtic and straight into Forster's arms.
Emenike, who has been the game's standout player so far, tries to slalom his way through the Celtic midifled but runs straight into Brown to draw the foul.
Samaras cuts in from the left but runs into a wall of Spartak trouble. If he had looked up he would have seen green and white support in the box.
Another break down the Celtic right from Lustig who intelligently squares to Brown who can't get enough power in his shot to beat Pesiakov.
Legendary rocker Rod Stewart is enjoying the match from the Celtic Park stands - wonder if there will be a repeat of his tears of joy after the Barcelona win?
Kombarov tries to plough his way through the Celtic defence before seeing his path blocked by Ambrose.
Celtic are just a little careless in possession at times, but will be delighted with their display so far.
End-to-end stuff as Jurado's shot from the corner is blocked before Izaguirre races 70 yards to win Celtic a set-piece of their own. The corner breaks to Commons on the edge of the box and his wicked left-foot volley flashes past the Spartak post.
Spartak win a corner after the pacy Emenike breezes past Wilson before Ambrose clears.
Plenty of noise around Celtic Park which, as you would expect, erupted after Hooper's strike.
Worrying moment for boss Lennon as Mulgrew goes down under a heavy challenge. But he gets to his feet and should be alright.
Spartak enjoying their best period of possession, knocking the ball around as they wait to make an incisive forward pass.
More Spartak pressure as Dmitri Kombarov twice breaks down the Celtic right but fails to make his crosses count.
Jurado looks to dance inside from the left but is met by Lustig who nickes the ball off his toes.
So what does that goal mean? It means Celtic will go through in second place behind Group G winner Barcelona, who are drawing 0-0 against Benfica. But there is a long time to go yet!
Spartak try to catch Celtic straight away as Emenike skips away from Wilson but blasts a sliced effort wide.
A glaring error by a Spartak defender allows Hooper to latch on to Samaras's long pass. He takes one touch before firing low underneath Pesiakov. Cracker.
GOAL! Gary Hooper puts Celtic ahead!
Another great delivery from Mulgrew, whose inswinger is punched rather unconvincingly over his own bar by Spartak stopper Pesiakov.
Lustig drives into the Spartak box and forces a corner.
Still goalless at the Nou Camp between Barcelona and Benfica so as things stand Celtic are out. But I guarantee there will be a few twists and turns yet.
Another dangerous run from Emenike but he is forced wide and the attack breaks down.
Superb effort from Kallstrom as Spartak carve the game's best chance so far. He plays a lovely one-two and curls just past the far post.
Celtic work the ball left to Mulgrew who takes a touch before sending in a dangerous cross which the Spartak keeper comes to gather.
Aidan Pidgeon, Dublin, via email: "I honestly believe that Celtic can win tonight, they use their best form for the Champions League,Spartak Moscow come into today's game on the back of two bad defeats, so all we can do is hope and pray now, 3-0."
Nigeria striker Emenike's movement has been impressive in these early stages. Celtic's defence must be more alert to his runs.
Another good run by Emenike who peels off Wilson as he tries to latch on to Ari's lofted pass, but the striker is marginally offside.
Another terrific ball from the Spartak left sees a moment of panic inside the Celtic area. Wilson swings out a foot before Ambrose mops up to avert the danger.
Another Celtic free-kick just inside the Russians half is pumped forward by Lustig and Samaras does well to head into the danger area. But it is too strong for strike partner Hooper to get on the end of.
Celtic win a free-kick in the right channel around 30 yards out after a harsh-looking Spartak handball. Mulgrew sends in a teasing curler which is headed clear by a Spartak defender.
A cross comes in from the Spartak left, with the Russians looking to get the wide at every opportunity, but Izaguirre calmly collects and clears.
A frantic start as you would expect with neither side settling down into any prolonged period of possession.
Samaras tries to launch an attack down the right touchline but cannot find a team-mate as Celtic lose possession.
Another rough challenge from Celtic does not impress the referee Felix Brych. Not sure this will continue for long until the German clamps down on someone.
Celtic win a free-kick of their own and send up the big men from the back. But it is headed clear as Spartak break quickly before Wilson races back to clear.
Surprisingly Kallstrom plays the ball short to Kirill Kombarov who blazes well over from distance.
Kris Commons clatters into Jurado with a robust challenge in the Celtic half. Very lucky to escape an early yellow card.
Celtic get the match underway but Spartak move into the home third before Forster collects a low cross at his near post.
The two teams come out of the Celtic Park tunnel to a huge roar. Here we go!
Quinlan Baker-Peng via email: "I think Celtic will win this 2-1, Neil Lennon's on the brink of Celtic history, and this will inspire them to progress! Go hoops!"
Celtic have scored four headed goals in the Champions League this season - more than any other team. Is this aerial threat Celtic's way to beat Spartak? Let us know your thoughts by emailing firstname.lastname@example.org or via Twitter @J_Jurejko.
However, Celtic's cause has not been helped by Barcelona resting most of their stars. Andres Iniesta and Xavi are missing, while Lionel Messi, who needs two goals tonight to break Gerd Muller's scoring record in a calendar year, starts on the bench.
Another quick reminder that Celtic will only progress by bettering Benfica's result. If their result matches Benfica's against Barcelona then the Portuguese will go through courtesy of their better head-to-head record against Lennon's side. Goal difference does not matter.
Right, who fancies a quick pre-match flutter? Luckily for those who do, Sky Bet's Jonathan Witty has been in touch with a few tips. He says: "Celtic must better Benfica's result to finish second and qualify for the last 16 and they are 2/5 to qualify tonight. A win is available at 8/11 and the draw 13. Celtic have won 14 and lost just two of their 22 Champions League home matches and their two defeats came against Barcelona. Spartak are 4/1 to win and add to that statistic. Georgios Samaras has been in decent nick in the Champions League so far this season and is enhanced to 5/1 to open the scoring."
Spartak: Pesiakov, Kirill Kombarov, Insaurralde, Suchy, Dmitri Kombarov, Rafael Carioca, Kallstrom, Jurado, Dzjuba, Ari, Emenike. Subs: Dykan, Bryzgalov, Pareja, McGeady, Yakovlev, De Zeeuw, Kozlov.
Former Bhoys winger Aiden McGeady begins on the bench for Spartak. The Republic of Ireland international has only recently returned to first-team action after six weeks out with a foot injury.
Celtic: Forster, Izaguirre, Ambrose, Wilson, Mulgrew, Lustig, Brown, Commons, Kayal, Samaras, Hooper. Subs: Zaluska, Matthews, Miku, Nouioui, Ledley, Rogne, Watt.
Lennon brings back his big guns, making nine changes to the inexperienced side which drew 1-1 against minnows Arbroath in the weekend Scottish Cup tie. Fraser Forster, Kelvin Wilson, Kris Commons, Gary Hooper and Georgios Samaras return, but Celtic are without influential Kenyan midfielder Victor Wanyama who is suspended.
Let me know your thoughts ahead of kick-off. Can Celtic bounce back from their indifferent domestic form to beat Spartak? And will Barcelona keep their side of the bargain by seeing off Benfica? Email your thoughts and predictions to email@example.com or via Twitter @J_Jurejko.
Few gave Neil Lennon's men hope of advancing from a difficult group, but the brilliant 2-1 home win against Barcelona - perhaps the most famous night at Parkhead - has given them a great chance of reaching the knockout stage for the first time since 2007/08. Can they see the job through?
Celtic Park has hosted many famous nights over the years - and tonight could be another one. The Bhoys host already-eliminated Spartak needing to better the result of Group G rivals Benfica to clinch a place in the last 16. The Portuguese side currently sit in second place but face a daunting trip to group winners Barcelona. I know which position I would rather be in - and it ain't Benfica's...
Good evening everybody and welcome to our live interactive text commentary of Celtic's crunch Champions League clash against Russian visitors Spartak Moscow in Glasgow. My name is Jonathan Jurejko and I'll be talking you through all the action.