The Sun reports that Spurs director of football Johan Lange travelled to Hamburg to hold talks with the 19-year-old Croatian about his long-term future at the club. Vuskovic is understood to be on relatively modest wages following his arrival on a five-year deal in 2023, and Tottenham want to raise his salary to a level commensurate with his first-team standing before suitors from Spain make a formal move.
Vuskovic joined Tottenham from Hajduk Split for around £12 million, though due to Brexit regulations he was unable to complete the move until after his 18th birthday.
He has spent this season on loan in the Bundesliga, where he has been the outstanding young defender in the division — leading all centre-backs in goals, clearances and aerial duels won, having recorded five goals in 26 league appearances. Hamburg's sporting director Claus Costa has confirmed the club has no option to buy and that his return to North London is contractually certain.
The Croatian is set to start for his country against England at the World Cup this summer.
Reports in Spain have credited both Real Madrid and Barcelona with serious interest, with a potential fee in excess of €60-70 million cited as the threshold that could force Tottenham into negotiations. Vuskovic's contract runs until 2030, giving Spurs full control, but the club are aware that without improved terms the situation could become harder to manage.
The player himself has given no indication of wanting to leave.
"After this season, I'll be a Tottenham player again," he told German outlet FAZ in April. "I have a contract there until 2030."
Under manager Roberto De Zerbi, who has a strong track record of developing young talent, Vuskovic is expected to push for a place in the first-team squad from the start of pre-season.