ADDED TIME We're into the first of three added minutes here.
1-1 You feel there will be one more match-winning moment in this one, can either side take the opportunity?
SUB FOR CHELSEA Danny Drinkwater is now on in place of Cesc Fabregas as Antonio Conte looks to make sure his side don't give away another goal before the final whistle.
SUB FOR CHELSEA Alvaro Morata looks set to come on for Chelsea here as Antonio Conte looks to get his side back in front in this first leg.
1-1 Chelsea will be annoyed with themselves here, after being in a very good position they have let it slip and allowed Barcelona to score a very important away goal.
GOOOAAALLL!!! Barcelona are level! Andres Iniesta pounces on a sloppy pass from Andreas Christensen and plays the ball into that man Lionel Messi who sends a first time shot into the bottom corner of the net. 1-1.
GREAT TACKLE Chelsea fly forward on the break through Willian but Gerard Pique makes a great recovering challenge to stop any dnager.
MAN DOWN Willian has had to leave the pitch with a knock here but looks like he will be fine to continue.
SINGING THE BLUES Antonio Conte's men have really worked hard to get themselves in front tonight and still look very solid at the back as Barcelona attempt to get back on level terms.
1-0 You have to say Willian fully deserved that goal after hitting both posts in the first half and what a goal it was. Can they keep a clean sheet now to seal an excellent night?
GOOOAAALLL!!! Chelsea are ahead! It's third time lucky for Willian who gets the ball just outside the box and finds the bottom corner of the net with a superb curling effort to make it 1-0 to the Blues.
BARCA PUSH ON Barcelona are still plugging away here as they look to break down the Chelsea defence. How long before we see changes made from the managers?
CHESS It's a real game of chess here now as both sides try to work out how to unlock the opposition defence. Will this one end up 0-0?
SHOT FOR SUAREZ Luis Suarez finds his first action of the game as he makes his way into the box before firing a shot across goal which the Chelsea defence get clear.
BATTLING BLUES Barcelona are again on top in terms of possession but Chelsea continue to defend well and keep the visitors at bay.
0-0 Chelsea have started this second half with the same defensive desire they showed in the first half. Can either side find the breakthrough here?
OVER THE BAR Eden Hazard is next go have a go for Chelsea as his right-footed volley flies just over the bar from 18-yards out.
OFF THE POST How close can Willian come for Chelsea without scoring? This time he picks the ball up on the edge of the box before firing his shot against the other post. So close for the home side.
CORNER Gerard Pique gets on the end of Ivan Rakitic's corner but his header from six-yards fails to find the target.
BLUES ON FORM Antonio Conte is looking very animated on the touchline as his Chelsea side remain level despite having the best chances of the game. Can they grab a goal before half time?
OFF THE POST Chelsea come within inches of taking the lead as Willian creates a yard for himself before curling a superb effort off the post from outside the box. Excellent stuff from the Blues attacker.
FREE-KICK Marcos Alonso bends in the resulting free-kick but his left-footed effort is comfortably saved by Marc-Andre Ter Stegen.
BOOKING Ivan Rakitic brings down the oncoming Willian just outside the box and goes into the referee's book. Good chance for the home side here.
0-0 The home fans are growing a bit frustrated here as decisions start to go against their side. However, a 0-0 draw would no doubt be a good result for Antonio Conte's side.
GOALLESS It's still all Barcelona here at the minute as the visitors look to try and pick off the Chelsea defence but so far the home side have held firm.
BARCA ON TOP Barcelona are really playing like the home side here now as they continue to dominate possession. However, can they break down this Chelsea defence before the break?
MAGIC MESSI? Lionel Messi has never scored against Chelsea but he's been the most active player on the pitch so far tonight and will no doubt fancy his chances of ending that run.
CHANCE FOR BARCA Lionel Messi lifts a cross onto the head of Paulinho at the back post but his header back across goal fails to find the target.
0-0 Barcelona are now trying to build a chance as Lionel Messi looks to find gaps in the Chelsea defence. Which side is going to break the deadlock here?
CORNER Antonio Rudiger gets onto the end of Willian's corner but he can only direct his header wide of the post from six-yards out.
JUST OVER Eden Hazard produces a great effort from 20 yards out as his left-footed strike fizzes just over the bar for Chelsea. Decent start from the home side.
BLUES VS BARCA It's been a lively start to this game as both sides look to get on the ball and create an early chance.