FC Groningen chief Hans Nijland insists they won't give up Richairo Zivkovic without a fight.
The teenage winger is a January target for Manchester City, while Liverpool are also keen.
But Nijland says: "They'll really have to go through us. We're not here to just turn over our players.
"In fact, we will do everything to keep them. Our cash position is fine, we do not need to sell. I do not expect that this winter players will leave."
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