Atletico Madrid's furious private reaction to Arsenal loss, penalty drama and UEFA complaint

Atletico Madrid were dumped out of the Champions League after a 1-0 defeat to Arsenal in their semi-final second leg, and their feelings about a number of contentious decisions have emerged

Atletico Madrid have been left furious after their controversial Champions League exit at the hands of Arsenal. The La Liga side suffered a narrow 1-0 loss at the Emirates courtesy of Bukayo Saka's first-half goal.

Diego Simeone's men huffed and puffed in a game full of flashpoints, yet they couldn't score. Unsurprisingly, tensions boiled over in stoppage time, with former Atletico sporting director Andrea Berta - now working for Arsenal - getting into a bust-up with Simeone near the dugouts.

But Atletico were unhappy before a ball was even kicked. According to Spanish outlet AS, Simeone and Co. felt aggrieved even before they landed in North London.

Atletico weren't pleased after learning that German referee Daniel Siebert would be in charge of the semi-final second leg. Siebert has now refereed four of their games against English teams, all of which they've failed to win. What's more, Bastian Dankert was on VAR and has now overseen Atletico's last three Champions League exits.

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Then, during the early hours of Tuesday morning, Arsenal fans let off a barrage of fireworks in attempt to stop Atletico's players from sleeping. Club chiefs are now said to be considering filing a complaint to UEFA.

When they travelled to the Emirates at around 6pm on Tuesday, Atletico's bus was without an escort for much of the journey. Home supporters had been waiting outside of the stadium and gave the visitors a fiery welcome.

Once the game started, a number of decisions which went against Atletico added to their frustration. Early in the second half, Giuliano Simeone, Diego's son, looked set to equalise by slotting into an empty net before he went down after contact with Arsenal defender Gabriel Magalhaes.

Should Atletico Madrid have been given a penalty? Have your say in the comments section.

Siebert waved away Atletico's vehement appeals and after a VAR check, Dankert agreed. Two minutes later, Riccardo Calafiori brought down Antoine Griezmann in the box and it would've been a clear penalty had Gabriel not been fouled in the build-up.

Atletico also felt that five minutes of stoppage time wasn't sufficient. As the clock ticked down, Arsenal did their best to halt play.

Gabriel Martinelli delayed the restart at one stage by throwing a ball into the crowd. Kepa Arrizabalaga, who was on the bench, then booted the ball away after it returned to the sidelines.

After full-time, Giuliano Simeone was so aggrieved that he took to Instagram. The winger posted an image of a challenge by Arsenal's Riccardo Calafiori, as he was seen shoving Simeone off the ball.

His dad, though, didn't want to dwell on refereeing decisions, having been asked about the incident involving Griezmann. "I'm not going to get into that," Simeone, who was calm after the final whistle and congratulated Arsenal's players, replied.

"We all know it was a foul. We all thought that the referee had got it right. I'm not going to get involved in that because I don't want to make excuses."

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