Being shaky and rusty is a problem. So Klopp has to find a way to get him some minutes.
I don´t know why he plays him, he probably wants to get Mignolet some rest and maybe he also sees some potential in Karius, I don´t know about that.
And if he plays him, he has to pick the matches carefully. And if everything goes well, if they win and he plays at least not bad (which in this case means: do not make mistakes that cause goals or even make us drop points), then Klopp does everything right.
I don´t know why he plays him, he probably wants to get Mignolet some rest and maybe he also sees some potential in Karius, I don´t know about that.
And if he plays him, he has to pick the matches carefully. And if everything goes well, if they win and he plays at least not bad (which in this case means: do not make mistakes that cause goals or even make us drop points), then Klopp does everything right.