The pair were both part of the Stoke City side that finished 19th in the Premier League last season, garnering just 33 points from 38 games and subsequently dropping back down to the second tier after a 10-year stay in the top flight.
Daniel Sturridge opened the scoring for the Reds with a powerful header and after PSG defender Juan Bernat conceded a needless penalty, James Milner doubled their advantage with a comfortable spot kick.
Klopp set his team out to dominate the midfield from start to finish, removing the dynamism of Naby Keita for the leadership and solidity of captain Jordan Henderson in the starting lineup, and this was a move that worked to perfection. They were so in the game, and while we had to fight a lot we also played football.
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Sturridge was taken off to make way for Firmino, who was initially left on the bench by Klopp after suffering a nasty eye injury in a clash with Tottenham's Jan Vertonghen at Wembley on Saturday.
"Super game from Daniel, I told him before the game that I never saw him as fit as he is now", Klopp added.
After the match, Thomas Meunier spoke to RMC and said that PSG should learn from the Anfield defeat and learn to move the ball quicker and more simply. Yes, when you have Bobby Firmino available, you actually always think, "Come on, bring him". "I loved his goal celebration".
"The pressure was strong with a super high Liverpool block". To play with a low block at this level is to shoot yourself in the foot. Now we'll see if Neymar remembers this jab when the two meet again at the end of November.