The Croatia defender, 18, is on a season-long loan at HSV from Tottenham.
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"I'm a man of conviction," said Polzin, when asked about extending Vuskovic's stay. "Of course, I also believe in things that are hard to imagine, even if they're a bit romantic about football."
However, the coach also added a caveat: "Nevertheless, there is a clear contractual agreement between the clubs."
The big factor in HSV's favour is Vuskovic wishing to play alongside his brother, Mario Vuskovic, who is serving a doping ban. Mario will be available for HSV from November next season.