However, Klopp's decision was correct, as the team went on to win 3-1 and go back to the top of the league table.
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Klopp confessed to TNT Sports: "Our general game until I think we made the changes was not great.
That's what we have to admit.
"It's tricky, we had such a low block (from Sheffield United) but you have to do better.
I'm really pleased for Cody (Gakpo) who came on and was incredibly good on the ball, scored a wonderful goal. Robbo (Andy Robertson) good, Harvey (Elliott) good, Curtis (Jones) good.
"They were really helpful and that's how it is; you have to change games from the bench when needed and so I'm really happy with that."