Atletico Madrid striker Antoine Griezmann has said the result against Arsenal on Thursday evening was down the defensive coaching from Diego Simeone.
The game couldn’t have began any worse for Atletico with the visitors reduced to ten men after just nine minutes.
Sime Vrsaljko was booked after just 70 seconds for bringing down Jack Wilshere as he tried to race towards goal and he received his second yellow and subsequent red when he came in late on Alexandre Lacazette.
Hector Bellerin was then penalised for a foul on Lucas Hernandez but the loud protests from Atleti boss Diego Simeone were deemed overzealous by referee Clement Turpin and he was sent to the stands.
Atleti started the second half brighter than the first but struggled to create any clear cut chances and Arsenal eventually broke the deadlock just beyond the hour mark.
Jack Wilshere got the ball on the left and clipped it to the back post where Lacazette rose highest to nod past Oblak and send the home fans into raptures.
Atletico seemed content with a one goal deficit and if anyone was likely to score, it was Arsenal, but with eight minutes left that all changed.
Jose Gimenez played a long ball forward towards Griezmann who was kept onside by Monreal, he held off Koscielny and despite his original shot being kept out by Ospina, he was first to react to the loose ball which he fired into the roof of the net to give Los Colchoneros a vital away goal.
“The result is because of Simeone,” Griezmann told reporters after the match.
“He has taught us how to defend, how to fight and battle not just in every game but in every training session too – it is our mindset.”
The return leg comes at the Wanda Metropolitano next Thursday evening, after Atleti have faced Alaves at the weekend.