The Dutchman is yet to find his best form since arriving from Sporting Lisbon.
But he told the Pink 'Un: "Of course you have a lot of people around you who have their opinion and they think they know what I think," said Van Wolfswinkel. "I know some people told other people that I was not enjoying it here, and that really frustrated me.
"I'm really, really happy here. And when you're not playing, people think 'Ah, it's just a toe injury - so he doesn't want to play; he doesn't want to be here'.
"These people really annoy me and frustrated me. I've heard things about it but what can you do? What can you say? So I just focused on my recovery, will be back soon and will show it on the pitch."
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