It is reported by "RB Sport".
The official start of the process will be announced later.
According to the source, UEFA held a ticket draw, and on May 10, fans began to receive cancellation notifications in their personal accounts.
The European Championship will be held in 11 cities from June 11 to July 11.
The tournament was postponed for a year due to the coronavirus pandemic.
For the same reason, host cities will not be able to provide 100% attendance at stadiums.
The stadium in St. Petersburg for the Euro 2020 matches will be 50% full.
Earlier, Robben admitted that he dreams of going to Euro 2020.