After a £47.5 million move from Leipzig, has fallen short of expectations in his first few months at Stamford Bridge and admits he is surprised by the physical nature of Premier League football.
"At the beginning, I had this self-image that I can go on doing my thing here, but in the last few months I have been brought down to earth. It's the way in England that you never have a quiet game.
"The players are 1.9 meters tall, brutal physically and really fast - including the defenders. It's impressive what intensity is going on in the Premier League."
has scored 10 goals and provided 9 assists in his 33 appearances for the Blues this season, and ended a 14-match goal drought by scoring in the 2-0 victory over
on February 15.
On dealing with the criticism he was targeted by this season, he said:
"Of course I noticed that in such a lull you are no longer necessarily called a super striker. I just had to let go of all the pressure of having to score goals."