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The Blues owner, who often appears stone-faced when not at the football, completely loses his cool in the game against Bayern Munich - as this footage shows.
The Russian oligarch lurches to one side as Cech saves the penalty, claps, jumps to his feet, roars, gives it the classic double fist-pump, before turning to shake a fist at someone behind him. His son goes even more berserk.
This vid of Roman Abramovich and his son's (on the right) reaction to Petr Cech's penalty save vs Arjen Robben is still one of the greatest Chelsea related videos of all time :clap: pic.twitter.com/7jO2kcKsUy- AAZ :flag_kz::flag_ru: (@AAZchelsea) March 20, 2021
Chelsea supporters are using the video as a reminder of how immersed their owner is in the west London club and its on-pitch glory.
An owner and a true fan. Thanks Roman. https://t.co/uwyuyrOVbR- Blueboy1905 (@Blueboy1905) March 21, 2021
Romans son as next owner. We are in safe hands https://t.co/jfurYUonl7- Istiaq Partho (@Partho__09) March 21, 2021
Damn..I love this man- Rohan (@AashiisBae) March 21, 2021
I remember there was also a video of Romans son crying in the tunnels in Moscow after we lost to United...man bleeds blue- Mark_Keith99:flag_ee: (@Keith13543357) March 21, 2021
The now 54-year-old bought Chelsea in 2003 and immediately began to splash the cash. While his goal was obviously to build the value of the club, there is also a strong belief that this is a passion project for Abramovic, a huge football fan.
Man are we lucky to have him when the likes of Kroenke run Arsenal into the ground. Don't hate him because he sacked Lampard, Be grateful for the change in form! pic.twitter.com/ZpTOWAJQ3q- - (@Replays96_) March 21, 2021
Domestic success arrived quickly during Jose Mourinho's first spell at the club, but ultimate Champions League glory proved trickier - with an agonising penalty shootout defeat to Manchester United in 2008.
Four years later, a depleted Chelsea made it past Pep Guardiola's Barcelona and into a final against Bayern (in Munich, no less). The German giants dominated the game until Thomas Muller finally broke through with just seven minutes to play.
But Didier Drogba's bullet header delivered an unlikely equaliser five minutes later, before the same player gave away a penalty in extra time for a foul on Franck Ribery.
Look at John Terry's reaction when Cech save Robben's penalty, Absolute Legend !! pic.twitter.com/VSqX8MbFz9- Mount~ (@EnjoySarri) October 3, 2015
When Cech leapt to save Arjen Robben's penalty - resulting in Abramovic's reaction in the stands - it looked like Chelsea's name might be on the trophy. And so it proved as they succeeded in the shootout, Drogba netting the final penalty.
We can only assume Abramovic and his family's reaction up above was just as impassioned as that of the players on the pitch or the fans in the stand.