Klopp's 2016 return to former club Dortmund saw the teams draw 1-1, with few signs of the wonderful drama that was to come in the second leg. Dortmund were 2-0 up inside nine minutes and although Divock Origi - a potential starter against Barca due to the absence of Salah and Firmino - reduced the deficit, Marco Reus then added a third away goal for the visitors.
And it was the second year in a row in which Barcelona were foiled despite holding a large first leg lead, bringing echoes of their loss at Roma last season.
Barcelona have managed to dump Liverpool out of the UEFA Champions League and are looking to seal the treble in the coming weeks.
Klopp said the youngster has regained match fitness to be considered for his senior debut.
"I would imagine that the players will be rocking before we score".
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Liverpool face Barcelona tonight and must overturn a three-goal deficit from their first leg at the Nou Camp.
Hard to argue with this quote after watching that performance from Jurgen Klopp's Liverpool and the fans at Anfield.
Their task has been made more hard with the news that Mohamed Salah and Roberto Firmino will be unavailable for the second leg, with the pair's combined totals of 42 goals and 17 assists this season likely to be a huge miss for the Reds.
Robertson was just trying to rattle Messi, which a lot of players have tried down the years but not many have succeeded.
Jurgen Klopp has never lost a two legged tie in Europe while at the Liverpool helm, but a Barcelona side led by Lionel Messi in strong form may just herald the end of that glittering record. There isn't much to suggest that won't still continue at the club next season.
What it does mean is that unlikely heroes have the chance to etch their name into club folklore, by majorly contributing in Liverpool's attempt of reaching Champions League final at the Wanda Metropolitano on 1 June.
"After the game in Spain we were confident we could score four and win 4-0", he said.