Klopp was left feeling frustrated after the game as he thought at least five of Ole Gunnar Solskjaer's men could have been sent off.
A source close to Klopp told the Athletic: "There could have been five red cards for United in total."
The source went on to speak about Fred's challenge on Keita, saying: "(Antoine) Griezmann got a red card for doing the same thing on Bobby (Firmino) in the previous game. Where's the consistency?"
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