That is it from me though.

Don't forget you can follow all the reaction to Arsenal's 3-1 home loss to Monaco here. You get the feeling Arsene Wenger could be in for a difficult few days.

Anyway, thanks for your company, see you again soon.

I'm not sure anyone expected Bayer to dominate possession quite like that. The positives for Atletico are they are still very much in the game but they will be wanting to watch Fernando Torres' disallowed goal again. How anyone could see if the ball had gone out is beyond me.

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Bayer Leverkusen and Atletico Madrid have both gone close to winning Europe's elite club competition. Bayer lost the 2002 final to Real Madrid, while Atletico lost the 1974 final to Bayern, as well as last season's devastating loss to Real.

They have a long way to go to catch up with some of Europe's leading lights but it is Bayer who have taken a step nearer the ultimate dream this evening.

Advantage Bayer Leverkusen but you get the sense we are set for a real humdinger of a second leg in a few weeks time. These two sides are not the best friends after that 90 minutes.

Disaster for Arsenal as Yannick Carrasco restores Monaco's two-goal advantage. Live text here.

Drama at Arsenal as Alex-Oxlade Chamberlain curls a pearler into the top corner. Hope for the Gunners. Follow the match here.

And now things erupt. Fernando Torres goes down under the challenge of Emir Spahic but it is Gonzalo Castro booked for his reaction. The Bayer midfielder is booked but as he receives his talking to, the rest of the players start having a bit of a melee. Torres also sees yellow.

Image source, AP

Bayer Leverkusen have been absolutely superb in this first leg. They more than deserve this advantage and still they push...

Nervy times for Bernd Leno. The home goalkeeper has been faultless but he blots his copybook as he flaps at a long throw, under the challenge of Diego Godin. but is given a very generous free kick. More for Mr Simeone to feel aggrieved about.

Atletico boss Diego Simeone has been slowly coming to the boil on the sidelines. With every Bayer foul that is made and every decision that goes against, he is going redder and redder. He is not a happy man.

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The night gets worse for Atletico as Tiago receives his second caution of the game for a heavy challenge on Karim Bellarabi. That tackle was largely due to frustration at the disallowed goal minutes earlier.

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Fernando Torres heads the ball into an empty net from yards out but the goal is disallowed and it is a brave, brave call from the official behind the goal. A corner from the left is flicked past his own goalkeeper by Wendell but the ball is adjudged to be out.

Bayer Leverkusen's dominance can be seen in the amount of passes both sides have made. The Germans have made 389 to Atletico's 244. Just as I write that, the ball drops to Fernando Torres inside the penalty area but he his shot is easy for Bernd Leno.

Hakan Calhanoglu might be getting a little carried away after his opener. He tries his luck from 40 yards and, despite hitting the target, it is easy for goalkeeper Miguel Moya.

Torres has been a spectator so far.

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Are things about to change?

Here comes Fernando Torres. The striker replaces midfielder Arda Turan as Diego Simeone goes for it. In true ABBA style an SOS Fernando.

Image source, EPA

Atletico suffered 14 fouls in the first-half against Bayer, more than in the a first-half of any other game this season. It seems the Spaniards are being beaten at their own game.

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A sensational strike from Hakan Calhanoglu gives Bayer a deserved lead. It looks as though the chance is gone as Karim Bellerabi dallies on the ball in the penalty area after a driving run. But, just when the chance appears gone, he back heels into the path of Calhanoglu, who unleashes a bullet into the top corner from an angle.

It is turning into a horror show for Arsenal as former Tottenham man Dimitar Berbatov rifles Monaco into a 2-0 lead. Follow the live text of the match here.

Atletico Madrid now haven't conceded a goal for 517 minutes, the longest current run in the competition. Kostas Mitroglou was the last player to score against the Colchoneros, on 16 September.