Karius is the latest Liverpool signing this summer.
Karius signed in a deal believed to be worth around £4.7 million last week and is expected to challenge Simon Mignolet to be the side's first choice 'keeper going into the start of next season.
Liverpool manager Jurgen Klopp walks off at half time
He told Sport Bild: “He was a big factor, because he is one of the best coaches in the world and has shown how well he brings young players forward.
“But there is also the tradition of the club, the atmosphere, which is not so common in the world. All in all, it was the perfect total package.”
It's of little surprise that a young, upcoming player wanted to work with Jurgen Klopp given the reputation he carries from his time in Borussia Dortmund, and the intense coverage that his time at Liverpool is getting in the German media.
Karius alluded to Klopp improving young players, and Liverpool do have a couple of examples of that this season with Emre Can and Divock Origi both making great strides in their development since the manager's arrival in October.
Liverpool's Simon Mignolet during training
There is a lot of expectation on the 22-year-old to be picked ahead of Mignolet next season given the problems the Belgian has encountered during his three years on Merseyside - and the need for fewer mistakes at the back if the Reds are to really kick on next season.
It could be a big season ahead for Karius, who still has a lot of development left in him. He's evidently hoping that Klopp can help improve him throughout the season so he is in a position to be the club's first choice goalkeeper for many years to come.