In the coming days this little piece of paper will become the most valuable thing for these supporters.
They will have to overcome endless queues and ridiculous prices if they want to get their hands on a ticket for what is seen as the most important game of the year.
Prices for the Milan showpiece are believed to range from 70 euros for the cheapest to 440 euros for the most expensive ones.
Atleti, Real and UEFA are set to meet on Thursday in order to discuss the distribution of the tickets.
With a capacity of 80,000 at Stadio Giuseppe Meazza, the two teams are expected to get around 21,000 tickets each, with the rest going to sponsors and different footballing bodies.
This was the case last time a final was played there – in 2001 between Bayern Munich and Valencia.