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Chelsea signed Christian Pulisic from Borussia Dortmund in January but the American international remained on loan at Borussia Dortmund for the rest of the season before switching to Stamford Bridge over the summer.
Pulisic has made four appearances for the Blues this season and he admits Premier League games are very intense.
“It is a very physical league as people say here,” Pulisic said, according to Chelsea’s official website.
“The games have been very intense, every game has presented its own challenge, every team is different. The Bundesliga was also a brilliant league.
“I can’t say it wasn’t because they are all good teams and every game was tough, but there a few differences but nothing major that I am not used to.
“London is amazing, it is quite a big city. Dortmund wasn’t the biggest city but a nice city but I am really happy to be here and I am definitely enjoying that side of things.
“The American culture is a lot different than really anywhere in Europe, the food you can get, the people, everything was a bit different.
“Going to Germany was a big shock for me but definitely coming here is a lot more similar to how it is in the US. Obviously not the same but a lot more similar.”