Postpublished at 65 mins
Barcelona 5-0 Celtic
Nir Bitton breaks up another Barca attack and decides to have a pop at goal from the halfway line, but his effort bounces harmlessly into the hands of Barca keeper Marc-Andre ter Stegen.
Summary
Messi scores either side of missed penalty by Celtic's Dembele
Neymar curls in free-kick at start of second half
Iniesta blasts in fourth for hosts, Messi completes hat-trick
Suarez adds two more
Postpublished at 65 mins
Irrepressible Messipublished at 21:06 British Summer Time 13 September 2016
Barcelona 5-0 Celtic
Pat Bonner
BBC Scotland pundit at Camp Nou"This could become quite embarrassing now. Again Celtic are giving the ball away and you just can't do that. Messi had that real desire to put the ball in the net and Celtic were just standing still."
GOAL Barcelona 5-0 Celticpublished at 60 mins
Lionel Messi (hat-trick)
This is officially a hiding now.
76 seconds after conceding the fourth Celtic concede a fifth.
Luis Suarez steals in behind the tiring defence and squares for Messi to slide in and turn the ball home to complete his hat-trick.
Celtic have another half-hour of this left......
GOAL Barcelona 4-0 Celticpublished at 59 mins
Andres Iniesta
Wow!
Neymar goes to the byline and clips a cross into the box where Andres Iniesta arrives to execute a wonderful first time volley to crash the ball into the net.
Stunning!
YELLOW CARDpublished at 56 mins
Barcelona 2-0 Celtic
Scott Brown goes into the book after a petulant push on Neymar, who accepts the invitation to throw himself to the floor in rather dramatic fashion.
A bit silly all round.
Postpublished at 53 mins
Barcelona 3-0 Celtic
It is a damage limitation job for Celtic now.
Moussa Dembele was the hero against Rangers at the weekend, bagging a hat-trick in a 5-1 win.
It's a different story for the striker this evening though. He's cut an isolated figure up front, and when his one big chance came along he missed from the penalty spot with the score at 1-0.
Tough shift for the Frenchman but he continues to battle manfully.
GOAL Barcelona 3-0 Celticpublished at 49 mins
Neymar
No way back now for Celtic.
Neymar and Messi stand over a free-kick 20 yards out directly in front of goal. You expect Messi to have a pop as he chases a hat-trick but it's Neymar who steps up to curl the ball over the wall and high into the net.
It's an excellent free-kick but Dorus de Vries - who got a hand to it - may feel he should have kept it out.
KICK-OFFpublished at 20:48 British Summer Time 13 September 2016
Barcelona 2-0 Celtic
Barcelona get us back underway at Camp Nou.
Celtic fans, more bad news I'm afraid.
Andres Iniesta is off the bench and into the action.He replaces Ivan Rakitic.
Postpublished at 20:46 British Summer Time 13 September 2016
HT: Barcelona 2-0 Celtic
Celtic's lost chancepublished at 20:43 British Summer Time 13 September 2016
Barcelona 2-0 Celtic
Image source, SNSImage caption, Moussa Dembele is brought down to win a penalty for Celtic, but the Frenchman's subsequent spot kick was saved
This is artpublished at 20:43 British Summer Time 13 September 2016
Barcelona 2-0 Celtic
Tom English
BBC Sport Scotland at Camp Nou"This is just gorgeous football. I don't want to get too pompous about it but it is art. Two goals from Messi, two assists from Neymar. Their speed of thought is just incredible. It's a different level of football. If Celtic can hang on and keep it at 2-0 that is a good night's work."
Caught in the headlightspublished at 20:39 British Summer Time 13 September 2016
Barcelona 2-0 Celtic
Scott McDonald
BBC Scotland pundit"Brendan Rodgers would have been saying to keep things tight and grow in to the game and within three minutes they've scored. He will be pulling his hair out. It was almost like a rabbit in the headlights. Scott Sinclair has been the shining light for Celtic. [On Dembele penalty miss] As soon as you miss a penalty...in the Nou Camp...1-0 down, it's bound to deflate you."
Can Celtic salvage something in Camp Nou?published at 20:39 British Summer Time 13 September 2016
Tweet @BBCSportScot, text 80295
Messi doesn't miss from therepublished at 20:36 British Summer Time 13 September 2016
Barcelona 2-0 Celtic
Image source, SNSImage caption, Neymar combines with Messi and it is the little Argentinian striker who pokes the ball into the Celtic net for his second goal of the night
HALF-TIMEpublished at 20:32 British Summer Time 13 September 2016
Barcelona 2-0 Celtic
Postpublished at 44 mins
Barcelona 2-0 Celtic
Messi is on a hat-trick and he is presented with a chance to seal it as Neymar pulls the ball back from the touchline to the edge of the area where the Argentine is lurking, but he can't keep his effort down.
Dembele's unconvincing penalty kickpublished at 20:29 British Summer Time 13 September 2016
Barcelona 2-0 Celtic
Moussa Dembele's penalty kick from a short run-up is saved by Barcelona keeper Marc-Andre ter Stegen.
Image source, SNS
Image source, SNSImage caption, This is what it feels like to miss a penalty against Barcelona
DISALLOWED GOAL Celticpublished at 42 mins
Scott Sinclair
Kieran Tierney slips as he shoots and the ball falls to Scott Sinclair. He tucks the ball away but was quite clearly in an offside position and the flag goes up.
Messi's magic touchpublished at 20:23 British Summer Time 13 September 2016
Barcelona 2-0 Celtic
Image source, SNSImage caption, Lionel Messi (second left) moves off to celebrate his 3rd-minute goal for Barca. It was the Argentina star's first touch of the ball
get involved Get Involvedpublished at 20:23 British Summer Time 13 September 2016
Text 80295
Nico: "Nothing annoys me more than when a guy takes one step back from the ball at a penalty! It very seldom pays off especially in Camp Nou!"
Margaret, Aberdeen: "Celtic are struggling. This could be a big score against. No surprise."