Fullkrug says he feels at the centre of things with the Hammers.
"I find the Premier League incredibly appealing. It was a great opportunity to start a completely new chapter in my life. This step felt right," he told BILD.
"Last season I was able to experience a home European Championship with the national team with unforgettable moments and play in the Champions League final with BVB. This gave me opportunities that I had to deal with, also due to the squad situation at Borussia Dortmund.
"I have managed to reach an even better level over the past three or four years. I want to keep it that way, it is very important to have a club where I play a central role, where I am important. Where the style of play is also somewhat geared towards me."
