The German central defender, 25, signed on loan from Bayer Leverkusen last month.
He said, "I prefer to let others talk about me but I like to get the ball down and I like to get stuck in.
"One thing I have noticed here straight away is that you can be more aggressive than in the Bundesliga.
"And there's a bit more leeway from the officials to go in and challenge for the ball - whereas in Germany they would be challenges which would result in a free-kick.
"Here, the big difference is you can challenge harder - and that is a mentality that I am getting used to.
"Everybody knows this is physically the toughest league in the world. But, for me, it is also the all-round best league in the world. Most players want to test themselves here and I was no different."
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