Klopp said: "He needs to get used to the things here. Wataru is a super guy, very calm and very polite and that cost him the first two weeks, maybe. That's now getting there. He is not 30 or whatever and wants to get some people out of the way to get into the team, but he is improving every day.
"You saw that today, he is there, he will help us a lot, he will play games, he will start games and all these kinds of things. It's all good, he had already three or four games now for us in a very short period. That is what counts, it is not a short-term project. Wataru is a super-important part of the squad and I am really happy to have him."