The young Croatian is on-loan this season with Hamburg SV.
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Ahead of Sunday's clash, Kovac enthused about the teen: "A huge talent, he already was at Hajduk Split.
"He made a good transfer to England to Tottenham, and now he's at HSV like his brother. He can become a regular member of the Croatian national team."
Vuskovic is tied to Tottenham until 2030.