Willian scores from 20 yards, Messi levels after Chelsea give ball away
Chelsea now unbeaten in last eight Champions League games with Barcelona
Muller (2), Coman & Lewandowski (2) score for Bayern Munich against 10-man Besiktas
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Kiran: Bringing on Morata after 82 mins too little too late. Chelsea already thrown game away when had massive opportunity against desperately poor Barca performance
Ross: Drinkwater isn’t a game changer. CFC playing got 1-1 now. Poor
Robert Lewandowski
A deft dissection of the Besiktas rearguard as Franck Ribery's outside of the boot ball sets Thomas Mueller running and the German squares for Robert Lewandowski to score his second and his side's fifth.
Three minutes left on the clock there.
Image source, ReutersChelsea 1-1 Barcelona
Alvaro Morata's first touch lures in Samuel Umtiti and his second nicks it past him to win a free-kick in a decent position.
But, with the central defenders up from the back, Chelsea don't manage to deliver.
Instead Victor Moses scuffs a shot wide and Alvaro Morata gets a booking for appealing too strongly for a corner.
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Anon: Yes Barcelona have levelled but you can’t say they have been anywhere near the impressive team advertised.
Kris: And there's the difference between a very good team and a world class team, Barca take the first chance they get, while Chelsea could have already been 3-0 ahead.
Chelsea 1-1 Barcelona
Antonio Conte shuffles his pack.
Alvaro Morata comes on for Pedro to add a little in attack while a tiring Cesc Fabregas is replaced by Danny Drinkwater to shore up midfield.
Image source, ReutersChelsea 1-1 Barcelona
A couple of yellow cards that got lost in the choas.
Luis Suarez goes into the book for appealing too strongly for a penalty in the build-up to his side's goal.
Antonio Rudiger joins him for a heavy foul on Sergei Roberto.
Both still clear to play in the second leg by the way.
Robert Lewandowski
Home and hosed?
You would have to think so. Robert Lewandowski tucks in a rebound to buy Bayern more insurance in the Allianz Arena.
Image source, Reutersjayceechamz: Just had to be in the script, messiah delivers.
Andrew Priestley: So sloppy at the back from Chelsea, but brilliant reading of play by Iniesta to pounce on the error, and such a calm finish from Messi. A huge goal in the tie.
Ayo Obit: So what's left on Messi's bucket list in English football? Score at Stoke on a Tuesday night perhaps?
Chelsea 1-1 Barcelona
Andy Townsend
Ex-Republic of Ireland international on BBC Radio 5 live
It’s so sloppy. Cesar Azpilicueta dives in, Iniesta picks it up in the box and Lionel Messi dispatches it.
It is an unnecessary square ball across the 18-yard box to nobody. Azpilicueta goes to ground too early, he could’ve stayed on his feet and worked Iniesta into a different position.
But once it comes back to Messi, he’s going to score.
Chelsea have handed Barcelona that goal.
Sho Rahman: That is so so bad from Chelsea. Gift for Barca who haven't been a threat all night.
Andrew Priestley: He’s only gone and broken his Chelsea duck!
That was Lionel Messi's first goal against Chelsea in 730 minutes of action. No other side have held out so long against the little man.
Lionel Messi
The first Chelsea mistake in defence and it is punished.
It is ruthless from Barcelona as Andreas Christensen's loose pass across the face of his own goal is intercepted by Andres Iniesta ahead of the stretching Cesar Azpilicueta.
The shot is on for Iniesta, but with the vision of a meerkat, he squares the ball across for Lionel Messi who curls low and unerringly into the bottom corner from 15 yards.
Image source, ReutersChelsea 1-0 Barcelona
Ousmane Dembele and Denis Suarez are the other attacking options on the Barcelona bench if Ernesto Valverde really fancies chasing the tie tonight.
His side are getting plenty of the ball but lack the penetration.
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Numan: There's something in the Chelsea DNA that just turns up against Barcelona. These pair are like old Shakespearian rivals you can never take your eyes off.
Rohan: A tactical masterclass once again from Conte, who has perhaps FINALLY discovered his tactical nous from last season. Tactics spot-on.
Image source, PAChelsea 1-0 Barcelona
There are some glum faces among the travelling contingent.
It was at this stage last year though that their side came back from a 4-0 first-leg defeat by Paris St Germain.
Press Office Peter: There might be a #KFCCrisis, but there's no #CFCCrisis.
John Moran: Azpilicueta is the best defensive Right-Back in the world. Criminally underrated #bbcfootball
Chelsea 1-0 Barcelona
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Chelsea 1-0 Barcelona
That opening goal is drawing Barca onto the sucker punch that Chelsea have been looking to land all night.
A lightning counter-attack has the visitors short-staffed at the back and Willian very nearly squeezes a return pass to the on-bombing N'Golo Kante.
Chelsea 1-0 Barcelona
Andy Townsend
Ex-Republic of Ireland international on BBC Radio 5 live
Brilliant from Willian - there is no player more deserving. After being unlucky hitting the post twice, this time he trusts himself.
It was hard and low, giving Marc Andre ter Stegen no chance.
The accuracy is there for everyone to see. A lead for Chelsea which, on chances, I think they deserve.
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We think Batshuayi quite enjoyed that goal....
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Phil McNulty
BBC Sport chief football writer at Stamford Bridge
Third time lucky for Willian and Stamford Bridge rocks with noise. The name of Antonio Conte rings around this part of west London.
Chelsea, and Willian in particular, have carried a threat all night and that goal was fully deserved.
Barcelona have been strangely sloppy in the final third and have struggled for end product - Chelsea will hope that continues.