The report says public-health authorities have urged stronger surveillance, clearer advice for travellers and easier access to vaccination before the competition begins.
That warning matters because measles is among the most contagious infectious diseases. Airports, hotels, fan zones and packed transport networks can all become pressure points if an infected traveller moves through them before symptoms appear.
The concern is not limited to matchday crowds. Supporters may cross borders several times, while players, staff and media will operate on similarly demanding schedules.
Health departments in host regions will need clear communication rather than last-minute messaging. Fans should know where to seek vaccination advice, what symptoms to watch for and when medical help is necessary.
The report says some specialists are already concerned that smaller health departments could face pressure from limited staffing and funding. That makes coordination between tournament organisers, national authorities and local clinicians essential.
Football also has a role. Federations and host cities can use ticketing platforms, travel information and stadium communications to promote sensible precautions without creating panic or stigma.
The tournament is still being sold as a celebration of global movement. Protecting that celebration will require preparation long before the opening fixture.
The next storyline to watch is whether host cities publish coordinated health guidance early enough for supporters to act before they travel.