Bruce admits the German has struggled to settle on Humberside.
He told the Hull Daily Mail: "The problem with Nick is his adaptation to the English game. He still hasn't quite grasped it.
"We thought he was maybe ready but unfortunately the physicality is something he finds difficult, especially playing in a cup tie. They're going to throw it into the box, scrap and fight, and that's exactly what they did. Unfortunately, he finds that a struggle.
"We'll see what the options are for him going forward but he's like anyone, he needs to play. He's not getting that here. There might be an opportunity (to move) but we'll see."
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