The key is registration status.
That matters for Spurs because Vuskovic’s loan spell at Hamburger SV has ended, putting him back on Tottenham’s books for the competition. For a club not expected to have a huge World Cup contingent, that makes his involvement more significant.
The mechanism does not only favour the parent club.
It is a reminder that player development now has layered value. Loans are no longer just about minutes and experience; they can also create financial knock-on effects when a player reaches a major international tournament.
The bigger story is not the payment itself. It is that Vuskovic, still only 18, is already relevant in senior international football and on Tottenham’s radar. If he remains in north London this summer, he appears to have a real chance of moving closer to the first team, especially if changes arrive in Spurs’ back line.
For Tottenham, the next point to watch is simple: how long Croatia stay in the tournament, and whether Vuskovic returns as a squad option or as a player attracting fresh transfer interest before the window closes.