Liverpool midfielder Gini Wijnaldum says Jordan Pickford's tackle on Virgil van Dijk was 'completely stupid'.
Pickford escaped retrospective punishment despite inflicting an anterior cruciate ligament injury on Van Dijk.
But Wijnaldum believes the Englishman's challenge was unintentional.
He said: "Of course we are upset. The way Pickford went in was completely stupid.
"I believe he did not want to injure Virgil the way he injured him.
"In my opinion, they take it too far in the games we play against them. Everyone wants to win the derby, sometimes you go a little over the top, but it was too much - not only his tackle, Richarlison on Thiago was also a nasty one.
"Accidents can happen in football. You can be unlucky and injure someone - but the way they were doing it was completely unacceptable.
"It makes it harder as they do not get punished, in this case Pickford."
