The Croatian was signed from CSKA Moscow this past summer.
"Everyone has been kind to me and I feel like I've been here already for a long time," said Vlasic ahead of Thursday's Europa League group stage clash with Dinamo Zagreb.
"The dressing room has been perfect. All the players are very polite and they always tell me if you need something just tell me and I'll help you with anything.
"All the players have been great to me.
"It's such an international game and we don't mind the differences in cultures and nationalities. We are all friends here and we talk about everything."
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