Bayern's English language Twitter account has just tweeted the excrement emoji, by the way. 

Extra time if there's no goals in the next hour.

Bayern on top now in Lisbon and Arturo Vidal - who scored the only goal of the tie so far - heads straight at Ederson in the Benfica goal.

The whistling from the Atletico Madrid crowd is so loud when Barca get the ball that I've genuinely had to turn down the sound on my monitor. Great atmosphere.

Yannick Carrasco goes down the left wing for Atletico Madrid and who's that tracking him all the way? It's Lionel Messi, who eventually beats the Belgian in their duel and comes away with the ball.

That's why you have Messi in your team. He's not the most skillful of players but he'll work really hard for you. Oh wait I'm thinking of Kevin Kilbane. Yeah, Messi doesn't usually do that.

Image source, AFP/GETTY

Bayern Munich have their first proper chance as Philipp Lahm's cross finds Thomas Muller, but he is under pressure and his hooked volley from 10 yards goes wide.

Diego Godin - one of the world's top centre-backs - shepherds Neymar out of play and then taps the Brazilian on the back of the head. The Barcelona star didn't seem too happy - maybe because he spent about six hours gelling his hair before kick-off.

Image source, AP

Barcelona have had 77% possession so far but this is Atletico Madrid's game. They won't have the majority of the ball but they will press and press and press and counter with purpose when they get the chance. Fifteen minutes in and they've had the only chances so far.

Image source, AFP/GETTY

Pretty quiet start at Benfica's Estadio da Luz. Bayern have had 75% of the possession but they've not done much with it. It's the hosts who need to score, Bayern go through as things stand.

Image source, Getty Images

Atletico Madrid have their third effort of the game as Antoine Griezmann gets a good header onto a cross but Marc-Andre ter Stegen is able to hold onto it. 

The hosts attack again but Yannick Carrasco's cross is over. Atletico only need to win this game 1-0 to go through on away goals.

Atletico Madrid have a couple of opportunities as Gabi fires an effort over and then Yannick Carrasco fires straight at Marc-Andre ter Stegen,

Image source, Reuters

An early chance for Benfica as Joshua Kimmich deflects a Eliseu free-kick out for a corner.

A real daunting atmosphere for Barcelona - every time they touch the ball there's a big boo from the Vicente Calderon crowd.

Image source, EPA

... and in Madrid

Under way in Lisbon...

European football expert James Horncastle on BBC Radio 5 live: "Lionel Messi hasn't scored or assisted a goal in four games, it's the first time that has happened in five years. 

"Do Barcelona look a bit physically and mentally jaded? They were under a transfer embargo until the January transfer window and the squad was left pretty thin. We've had to see more or less the same starting XI most weeks and, maybe, as we have got to mid-April that has taken a toll. 

"Maybe, this week could be when it all unravels. The last thing they want to do is go to the Calderon, which has one of the most intimidating atmospheres in European football."

Image source, EPA

Players out for both games - almost time for action.