If citeh fucked up last day & we won it then it would be a bizarre set of scenes in the stadium, cos the wifi & mobile data is so unreliable it's almost non existent you'd have fans listening to radios circa 1975, & us winning it would be through word of mouth & presumably George making a PA announcement.
You'd have a situation too, where presumably Klopp wouldn't be letting the players know during the match, so they'd find out at the same time as the majority of the fans, or by actually hearing the fans sing it!