A £23.6m capture from Ajax, Klaassen arrives with a reputation as a hard-working, goalscoring midfield player.
The 24-year-old, though, believes there is more to come following his move to England.
“I will just try my best and I think I’m going to improve here every day,” said Klaassen. “Now I’m just looking forward to all the games and all the training because I already feel good here.”
“I’ve spoken to the manager about how I feel, how I’m settling, that type of stuff, and I feel really welcome here.
“The life is a little bit the same as in Holland. I live in a hotel now, it’s good and I’m looking for a house as well.”