Last Updated: 07/11/12 9:36pm
FULL-TIME: Celtic 2 Barcelona. Celtic have done it as they record a famous win over Barcelona thanks to goals from Wanyama and Watt with Messi netting a late consolation for Barcelona.
GOAL: Barcelona pull a goal back as Messi scores from close-range after Forster can only push Villa's shot into the path of the Barcelona ace.
Watt almost gets in on goal again but he goes down under pressure from Mascherano, but the referee waves away Celtic's appeals for a free-kick and what would have been a certain red card.
GOAL - Tony Watt - Parkhead goes crazy as Watt is sent clear and fires home the second, unbelievable scenes!
Iniesta works from space on the edge of the box to line up a shot, but he drills it well over the top.
Samaras is lucky to win a free-kick on the edge of his own box as he takes too long to clear his lines.
Celtic make their first change of the game as Tony Watt comes on for Lustig meaning Ambrose shifts to right-back and Mulgrew drops into central defence alongside Wilson.
Another fantastic save from Forster as he dives full stretch to keep out Messi's shot after Alba picked him out inside the box.
Song is lucky to be still on the pitch as already on a booking he fouls Miku. The midfielder is playing with fire lucky escape for Barcelona.
Massive chance for Celtic as Bartra misjudges a long ball into the box allowing Mulgrew to get on the end of it, but the defender gets back to block his goalbound effort.
Great double save from Forster as he gets down low to save Sachez's initial shot before getting back to his feet quickly to keep out his follow up effort with his legs
Forster does well as he races his line to prevent the ball going behind for a corner to ease the pressure for Celtic.
Messi works some space on the edge of the box before curling a shot towards the top corner that is well saved by Forster.
Mulgrew robs the ball from Messi and sets off a run towards goal before being blocked by the Barcelona defence.
Mascherano tries to seek out Pedro with a long through-ball, but his pass is overhit and runs out of play.
HALF-TIME: Celtic 1 Barcelona. The referee brings the first half to a close with Wanyama's goal the difference between the two sides. Barcelona have struck the woodwork twice as they push for an equaliser.
Xavi almost puts Alves in on goal, but his pass is just overhit and it runs out of a play for a goalkick.
Mascherano makes a vital last-ditch tackle on Miku to deny the Celtic striker getting in on goal from Mulgrew's cross.
Barcelona go so close again to equalising as Alves sends over a cross from the right and Sanchez is unlucky to see his header come back off the post.
Lovely move from Barcelona as Sanchez plays in Alba, but there is no one in the six-yard box to convert his inviting cross to the relief of the Celtic defence.
Barcelona dominating possession as they probe for an opening, but so far the Celtic defence holding tight.
Good attack from Celtic as Matthews gets in down the left, but his cross towards Samaras is just too close to Valdes who collects the ball.
Iniesta fires in a shot with his left-foot which is blocked by Wilson. All hands to the pump now for Celtic.
GOAL: Wanyama heads home Mulgrew's corner to send the home fans into raptures. Poor defending from Barcelona as Wanyama rises above Alba to head home past Valdes.
Wanyama is all over the pitch as he tries to get Celtic going and the home fans appreciate his effort. Celtic win their first corner of the game.
Good tackle from Ambrose on Messi inside the box to rob the Barcelona ace of the ball. The pressure is building on the home side.
Matthews' long throw is punched clear by Valdes before Celtic are caught offside as the ball comes back into the box.
Good play from Wanyama in the middle of the pitch to rob Iniesta of the ball. Celtic will need to do a lot of that tonight.
Messi wastes a great chance to open the scoring after beeing teed up by Alba, but the Argentine drives his shot over the crossbar. A warning sign for Celtic.
Celtic win a free-kick as Samaras is fouled by Mascherano. Chance for Celtic to get a ball into the box, but Mulgrew plays it short before firing in a cross which is cleared by Song.
Wanyama puts in a good tackle to deny Sanchez and Willson then keeps out Pedro as Celtic win a goalkick.
Samaras is leading the link for Celtic with Miku playing the support role dropping deep to help the midfield.
Nevam Higgins thinks the Barcelona defence looks weak and expects Celtic to score and he is going for a 2-2 draw.
Akshet Shetty would love to see Celtic come away with a win, but is predicting a 2-0 win for Barcelona. What do you think the score wil be?
Gerard Pique has been added to Barcelona's squad after returning from a foot injury but he started on the bench although the Catalan giants paraded their big guns, Lionel Messi, Andres Iniesta and Xavi Hernandez
You can get in touch with your thoughts, predictions, opinions and jokes (within reason) throughout the course of the evening and I will do my best to publish those that make me think or laugh. Contact me at peter.O'Rourke@bskyb.com or via twitter @SkySportsPeteo
Shahbaz Ahmed is expecting Barcelona to teach Celtic a lesson feeling it will be an easy win for the Spanish titans. What do you think?
Barcelona starting XI: Victor Valdes; Daniel Alves, Marc Bartra, Javier Mascherano, Jordi Alba; Xavi, Alex Song, Andres Iniesta; Alexis Sanchez, Lionel Messi, Pedro
Celtic starting XI: Fraser Forster; Mikael Lustig, Kelvin Wilson, Efe Ambrose, Adam Matthews; Kris Commons, Victor Wanyama, Joe Ledley, Charlie Mulgrew; Giorgos Samaras, Miku
Gerry Cassidy in Christchurch New Zealand is hoping Celtic can take something from the game after going so close two weeks at Camp Nou
If you would like to get in contact at any point this evening then please don't hesitate. You can mail me via the Score Centre, email me direct on firstname.lastname@example.org and you can also now Tweet me: @skysportspeteo
Giorgios Samaras, though, is fit after recovering from an ankle problem and Miku will start in attack in place of Hooper.
Some breaking team news as Gary Hooper misses out for Celtic through injury and Scott Brown is sidelined with a virus
Welcome to our minute-by-minute commentary of Celtic's Champions League game against Benfica from Celtic Park.