The goalkeeper has since come in for a vile barrage of abuse from livid Liverpool fans on social media, some of whom have wished death on the German 'keeper and said they hoped members of his family would "die of cancer." .
Karius' attempted throw deflected into the net off Karim Benzema to break the deadlock and he was also at fault for Gareth Bale's goal which made it 3-1, as he fumbled a seemingly straightforward shot into his own goal.
The 24-year-old, who has made a total of 49 appearances for Liverpool across all competitions since signing from Mainz in 2016, broke down in tears at the full-time whistle, later adding "I lost my team the game".
In between all that he got buried by maybe the best goal the Champions League goal ever scored, Bale again catapulting himself into the Kiev night to fire an overhead kick into the top corner from a ludicrous height and distance. 'My Liverpool boys fought hard and I'm proud of them.
"If Salah was on, if Karius didn't make mistakes. but it is all if".
However, for Liverpool legend Jamie Carragher, the damage has been done and there might not be a way back for Karius.More news: Burkina Faso minister visits China after breaking with Taiwan
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"Haven't really slept until now, the scenes are still running through my head again and again. I'm infinitely sorry to my teammates, for you fans, and for all the staff", Karius said.
"I think it's impossible for him". "I know that I messed it up with the two mistakes and let you all down".
Unfortunately, what occurred in Kiev, will go down in the history books as Real Madrid became the first team to win the Champions League three times in a row in its current format. And this is where, we talking about it and the value of it, particularly when it comes to Real Madrid, this is where experience matters.
Meanwhile, Karius remains subject to plenty of scrutiny on social media.
"We take social media posts of this nature extremely seriously" police said.